SSS.6.170 - Liberty Precision Machine Anthem-S2 QD and the Savage Model 10 PC .308
/Liberty Precision Machine Anthem-S2 QD on a Savage Model 10 .308 with 20-in Barrel
The Anthem-S2 QD is designed and manufactured by Liberty Precision Machine. It is a 30 caliber centerfire rifle silencer, intended to suppress most cartridges with projectiles appropriately sized to travel through the bore. It has a 1.74-inch diameter and is 7.5 inches long with the included ATLAS mount coupler and muzzle brake mount installed. The user may choose to remove the ATLAS coupler and use other third-party adapters compatible with the 1.375”-24tpi system. The silencer is tubeless and all welded components are stainless steel. The end cap of the Anthem-S2 QD has a center section removeable aperture for future distal orifice changes. The silencer also uses a serial-ID ring on the rear portion of the silencer, under license. The silencer, mount coupler, and muzzle brake weigh a total of 18.1 ounces, as tested. The Anthem-S2 QD can be obtained from Liberty Precision Machine Dealers.
PEW Science is an independent private testing laboratory and also hosts the world’s only independent public suppressed small arms research cooperative. Testing, data analysis, and reporting is generated with funding provided by PEW Science members. Any test data that is generated with any portion of private funding contains this disclosure. The testing and analysis production for this Sound Signature Review was funded in part by PEW Science Project PEW-LPM-087-001-24. Therefore, data pertaining to the Anthem-S2 QD in this Sound Signature Review is published with the express written permission of Liberty Precision Machine, LLC.
This review contains single test results using the Liberty Precision Machine Anthem-S2 QD with the direct-thread mount on the Savage Model 10 Precision Carbine rifle, chambered in .308WIN with a 20-inch barrel. Federal XM80 149gr ammunition was used in the test.
Section 6.170.1 contains the Liberty Precision Machine Anthem-S2 QD test results and analysis.
Section 6.170.2 contains back pressure and Suppression Rating comparisons with selected .30 rifle silencers possessing a PEW Science Back Pressure Metric, Ω [Pa-1] in Omega Zones 6 and above. An updated Ω metric chart for the full suite of publicly evaluated .30 rifle silencers is also provided in this section. Further information about the Ω metric and Omega Zones can be obtained in PEW Science Research Supplement 6.40 (Public Article).
- Section 6.170.3 contains the review summary and PEW Science laboratory staff technical opinions.
Summary: When paired with the Savage M10 20” .308 and fired with Federal XM80, the Liberty Precision Machine Anthem-S2 QD with the ATLAS coupler and brake mount achieved a Suppression Rating™ of 46.9 in PEW Science testing.
The subsonic 300 BLK performance of the Liberty Precision Machine Anthem-S2 QD with the same mount system is detailed in Sound Signature Review 6.171, in which it achieved a composite Suppression Rating of 68.4.
As with all weapon systems, the user is encouraged to examine both muzzle and ear Suppression Ratings.
Relative Suppression Rating Performance is Summarized in SSS.7 - PEW Science Rankings
6.170.1 Liberty Precision Machine Anthem-S2 QD Sound Signature Test Results
A summary of the principal Silencer Sound Standard performance metrics of the Liberty Precision Machine Anthem-S2 QD is shown in Table 1. The data acquired 1.0 m (39.4 in) left of the muzzle is available for viewing to all. This is a members-only review and includes pressure and impulse waveforms measured at the shooter’s ear. PEW Science thanks you for your support; further testing, research, and development of PEW-SOFT and the Silencer Sound Standard is made possible by members like you!
Table 1. Liberty Precision Machine Anthem-S2 QD Sound Metric Summary
6.170.1.1 SOUND SIGNATURES AT THE MUZZLE
Real sound pressure histories acquired with PEW-SOFT™ are shown below. The waveforms are not averaged, decimated, or filtered. The data acquisition rate used in all PEW Science testing is 1.0 MS/s (1 MHz). The peaks, shape, and time phasing (when the peaks occur in relation to absolute time and to each other) of these raw waveforms are the most accurate of any firearm silencer testing publicly available. PEW-SOFT data is acquired by PEW Science independent testing; the industry leader in silencer sound research. For more information, please consult the Silencer Sound Standard.
The primary sound signature pressure histories for all 5 shots with the Anthem-S2 QD are shown in Figure 1a. The sound signatures of Shot 1, Shot 2, and Shot 3 are shown in Figure 1b, in early time. The real sound impulse (momentum transfer potential) histories from the same 5-shot test are shown in Figure 2a. In Figure 2b, a shorter timescale is shown comparing the impulse of Shot 1 to that of Shot 2 and Shot 3.
Fig 1a. Liberty Precision Machine Anthem-S2 QD Bolt Action Rifle Muzzle Sound Pressure Signature
Fig 1b. Liberty Precision Machine Anthem-S2 QD Bolt Action Rifle Muzzle Sound Pressure Signature, Short Time Window
Figure 2a. Liberty Precision Machine Anthem-S2 QD Bolt Action Rifle Muzzle Sound Impulse Signature
Figure 2b. Liberty Precision Machine Anthem-S2 QD Bolt Action Rifle Muzzle Sound Impulse Signature, Short Time Window
The Liberty Precision Machine Anthem 2 series contains silencers that use an updated version of the technology implemented in the Anthem series, previously characterized in the test report of the Liberty Precision Machine Anthem-S (6.79). The Anthem-S2 QD examined in this test report is the mid-size iteration of the updated series, sharing design attributes with the Mach S. For all intents and purposes, the Anthem 2 series silencers are Mach series silencers manufactured from stainless steel instead of titanium. Therefore, performance of the Mach S is postulated to be similar to that of the Anthem-S2 QD in this report.
Anthem 2 and Mach Series Research Note: A distinct difference between the two silencer configurations noted above may be the mount, depending on user implementation. In this test program, the Anthem-S2 QD was tested with the included ATLAS HUB-compatible threaded coupler and Liberty Precision Machine Liberty Bell muzzle brake. This is the factory configuration of the silencer. As its sister silencer, the titanium Mach S, includes a direct-thread adapter like the larger titanium Mach L, care must be taken when extrapolating test results and analysis from a silencer in the Anthem 2 series to the Mach series, and vice versa. PEW Science laboratory testing and analysis indicates that there are two primary performance differences between the two mounting choices:
The direct-thread mount decreases the distance between the muzzle orifice and the first reflector (blast baffle) of the silencer. This dimension controls initial wave expansion and likely influences suppression performance by changing the proportion of annular utilization and primary bore propagation in early time.
The Anthem 2 and Mach series are constructed of stainless steel and titanium, respectively. The ATLAS and brake combination included with the Anthem-S2 QD are stainless steel. There also exist titanium versions of the ATLAS coupler. The threaded connections and material densities, in combination with dimensional changes in (1), may result in impedance mismatches that change internal combustion signature propagation to free air in early time. These structural resonance-driven phenomena have a measurable influence on signatures propagating to the operator’s head due to close proximity.
Use of thread couplers like the ATLAS and associated mounts may induce damping effects, which may reduce resonance in some systems, depending upon silencer construction and materials. At signature severities characterized by high(er) Suppression Ratings (e.g. 60-zone and above), these measurable signature differences contribute to severity differentials that are somewhat above nominal and are audible to many users. The primary presentation of undamped resonance phenomena may be subjectively interpreted by the operator as a "metallic pinging," a short duration "ping” or "ring,” or other "metallic sounding” event. These are high-frequency effects and are discernible to the shooter when comparing the Mach-L to the Anthem-S2 QD with subsonic 300 BLK (reports 6.164 and 6.171, respectively). The shooter’s ear Suppression Rating differential between those reports reflects this. Although the Mach-L has a less severe free field signature in totality, the operator is in very close proximity to the blast chamber when fielding this weapon system, and therefore directly subjected to the aforementioned phenomena in early time. Late time phenomena dictate that most operators will still interpret the Mach-L to “sound quieter” with subsonic 300 BLK on that host weapon, despite its slightly lower shooter’s ear Suppression Rating when compared to the Anthem-S2 QD. Although the more severe 7.62 NATO platform (in this report) likely masks this type of resonance differential to the operator, it is also measurable in the combustion regime examined in this test report. The reader may examine the early time combustion signature in Figure 1b of report 6.163 (the direct-thread mounted Mach-L) and compare it to Figure 1b in this test report, above. Additionally, to isolate only material change as a variable, the reader may examine the same in Figure 3b of report 6.79 (the direct-thread mounted previous generation steel Anthem-S) and compare it with 6.163.
In summary, mount type, geometry, material configurations, and other differences that may be considered trivial by some users in a suppressed small arm weapon system, can influence measured signatures, and therefore operator and bystander risk metrics, in unintended ways. PEW Science encourages thoughtful consideration if extrapolating testing and analysis results to use cases that differ from the explicitly noted test conditions and parameters.
Previous evaluation of the Mach-L (6.163) showcased how the performance of the updated Anthem series design behaves with further distal flow restriction, as the Mach-L is a full-length silencer. In the Anthem-S2 QD evaluation herein, analogous to the mid-sized Mach S, there are several notable features in the test data that illustrate the gross improvements gained in the same size envelope of the previously evaluated Anthem-S, direct-thread (6.79):
Slightly delayed gas throttle onset with longer duration than previous (Fig. 1b).
Delayed and reduced first-round-pop (FRP) divergence (Fig. 1b).
Reduced internal combustion signature prior to initial coupled jetting (as discussed above, Fig. 1b).
More delayed positive phase impulse accumulation with differing slope (Fig. 2a).
Somewhat more consistent accumulation from latent shots in the string (Fig. 2b).
The Anthem 2 series possesses more significant distal flow control than its previous generation, and while it exhibits very similar muzzle signature severity, has somewhat reduced operator risk, on average. The Anthem-S2 QD may therefore be considered a “more refined” version of the Anthem-S. At a total tested system length of 7.5 inches, the Anthem-S2 QD exhibits higher sound suppression performance on this weapon system, in totality, than any other silencer of the same length in the current Standard pedigree. The reader is encouraged to examine the Rankings table, here. PEW Science Members may use the Suppression Rating Parametric Visualization Tool in Section 7.2 below the table on that page to filter for length and other parameters.
PEW Science Research Note 1: Like the larger silencers in the updated Anthem 2 and Mach series, significant and efficient pressure stagnation relief with accompanying downstream restriction is the primary combination of gross performance attributes in the Anthem-S2 QD that produce the noted efficiency in the measured pressure field displayed above. While reduced in performance compared with the longer Mach-L, the shorter Anthem-S2 QD performs on-par with, or even outperforms, high-performance silencers on this platform such as the Aero Precision Lahar-30L (6.112), Thunder Beast ULTRA 9 (6.24), CGS Helios QD (6.13), Silencer Central Banish 30 Gold (6.69), Rugged Surge (6.22), and Diligent Defense Enticer S (6.68).
The silencers listed above are all significantly different and represent a variety of ways to achieve similar performance through the use of different technologies. Again, for the total system length, the Anthem-S2 QD provides extremely competitive suppression performance.
PEW Science Research Note 2: The closest performance competitor to the Anthem-S2 QD on this host weapon in both size and performance is the aforementioned Aero Precision Lahar-30L. Direct-thread mounted, the Lahar-30L is almost identical in length to the tested configuration of the Anthem-S2 QD. The technology employed in the Lahar series is traditional curved-cone geometry in a tubeless configuration. The enhanced stagnation relief in the Liberty Precision Machine Anthem-S2 QD does allow notable efficiency gains. However, it is very interesting to note that the performance of the two silencers is still very similar, in a gross risk-reduction sense, on this host weapon system. This comparison offers a window into the potential diminishing returns of coaxial designs when compared to highly efficient conventional geometries in certain combustion regimes. Although the Lahar-30L is somewhat longer and heavier, its design envelope is comparable to the Anthem-S2 QD, in totality.
PEW Science Research Note 3: Unlike in the previous examination of the Mach-L, the blast load impulse accumulation from the Anthem-S2 QD is not shown to increase later in the shot string (Figure 2). This stabilization may be due to the difference in thermal conductivity between stainless steel and titanium. The titanium Mach-L may increase in temperature more rapidly during the shot string. Therefore, the heat-soak phenomenon may be reduced with the stainless Anthem series. When shooting over a longer time period, this difference may be of no consequence. The difference is reported here for completeness, and to reconcile the difference in momentum accumulation(s) noted in the two tests for the reader. Note that the relative FRP severity from the Anthem-S2 QD, on this weapon system, is significant to both the operator and to bystanders. Also note that this is a key difference between this silencer and silencers like the ULTRA 9 and Surge. Although the silencers perform similarly on average and therefore have similar Suppression Ratings, the FRP masking capabilities from the ULTRA 9 and Surge are more advanced than that of the Anthem-S2 QD.
As typically indicated, first-round sound signatures always differ from subsequent shots, as the atmosphere within the silencer changes. The FRP phenomenon cannot always be shown by viewing only the peak sound pressure. This is one of the reasons why The Silencer Sound Standard requires examining multiple sound signature metrics. Ammunition consistency can play a role in the determination of FRP, however, the close examination of measured pressure and impulse waveforms typically excludes ammunition from the possible factors influencing true FRP, due to the relative consistency of most high quality factory ammunition.
PEW Science has made a concerted effort to characterize the FRP phenomenon with true physiological human inner-ear response analyses. Additional PEW Science Member Research Supplements containing this information are released periodically.
6.170.1.2 SOUND SIGNATURES AT SHOOTER’S EAR
Real sound pressure histories from the same 5-shot test of the Liberty Precision Machine Anthem-S2 QD acquired with PEW-SOFT at the shooter’s ear are shown below. Again, the waveforms are not averaged, decimated, or filtered. The data acquisition rate used in all PEW Science testing is 1.0 MS/s (1 MHz).
The primary sound signature pressure histories at the ear for all 5 shots are shown in Figure 3. The primary sound signature history is shown on the left. A zoomed-in timescale is displayed on the right, in the region of peak sound pressure for Shot 1, Shot 2, and Shot 3. The real sound impulse (momentum transfer potential) histories at the ear from the same 5-shot test are shown in Figure 4. Again, full and short timescales are shown.
Figure 3a. Liberty Precision Machine Anthem-S2 QD Bolt Action Rifle Ear Sound Pressure Signature
Figure 3b. Liberty Precision Machine Anthem-S2 QD Bolt Action Rifle Ear Sound Pressure Signature, Short Time Window
Figure 4a. Liberty Precision Machine Anthem-S2 QD Bolt Action Rifle Ear Sound Impulse Signature
Figure 4b. Liberty Precision Machine Anthem-S2 QD Bolt Action Rifle Ear Sound Impulse Signature, Short Time Window
The operator hazard reduction with the Anthem-S2 QD on this platform is somewhat improved from the previous generation Anthem-S, but not significantly. Again, it is a more refined version of the technology.
PEW Science Research Note 4: As in previous testing of the longer iteration of this technology, the Mach-L, several of the same phenomena highlighted in the signatures measured at the muzzle are again visible in the signatures measured adjacent to the operator’s head. It is extremely important to note that the signatures measured above are, in fact, recorded adjacent to the head; the transfer function and wave reflections induced from this real test case do influence severity analysis. Furthermore, the coupling between that influence and the phenomena originating from the muzzle signatures coalesce with factors that have elevated importance in close operator proximity. One such factor is the delay in time between first coupled jetting and the onset of primary flow. These events are highlighted in Figure 3b, above, as they were in the Mach-L test report.
As discussed in the Anthem 2 and Mach Series Research Note in the first section of this report, differences in mounting system and silencer material can influence signatures at the shooter’s ear in different ways. In this test, the high amplitude of weapon system combustion from the 7.62 NATO cartridge somewhat nullifies the contribution of material variation in the risk calculations. However, it is likely that the influence of mounting system changes from the Anthem-S to the Anthem-S2 QD are somewhat responsible for the more uniform behavior of the updated version of the silencer. By increasing the distance from muzzle orifice to first reflector, the blast wave may more uniformly expand into subsequent vent paths. As the internal geometries of the silencers are somewhat different, it is not possible to further postulate mount change performance differentials with the current dataset.
PEW Science Research Note 5: Interestingly, the FRP to the shooter with the mount coupler used in this test is shown to somewhat increase in relative severity over that observed in the test of the previous generation Anthem-S silencer which was tested with the direct thread mount. This could be due to the same increased wave expansion in early time that allows for more uniform combustion propagation later in the shot string. More testing is needed to examine these variables.
The reader may examine the overall performance spectrum in the PEW Science Rankings Section. The reader is encouraged to use the Suppression Rating Parametric Visualization Tool in Section 7.2 below the table on that page to filter for length and other parameters.
As typical, the overall sound signature measured at the shooter’s ear possesses significantly less amplitude in both the pressure and impulse regimes than the signature measured at the muzzle (refer to Table 1). Furthermore, the application of both pressure and impulse at the shooter’s ear is delayed when compared to the pressure and impulse at the weapon muzzle. The combination of varying amplitude and rise time to peak amplitude influences the response of the human ear.
It is extremely important to note that muzzle signature influences the signature to the weapon operator. This is a test on a bolt-action rifle. Similar jetting phenomenon measured at the muzzle propagates toward the shooter. The standoff of the endcap to the shooter, as well as angle of incidence of the pressure (blast) waves, result in exponential decay of hearing damage risk when compared to personnel adjacent to the muzzle.
6.170.2 Relative Suppression Rating and Back Pressure Comparisons (.30 Rifle Silencers)
The Liberty Precision Machine Anthem-S2 QD suppressor is intended to offer significant sound signature suppression across the pressure field, without regard to system backpressure. PEW Science has developed an empirical relation to quantify the back pressure (flow restriction) of silencers. Figure 5 and Figure 6 show supersonic suppression and back pressure comparisons between selected 7.62mm (30 caliber) rifle silencers shown in public PEW Science Sound Signature Reviews, as of the date of this review publication. The results shown in Figure 5 and Figure 6 are calculated from real test data acquired with PEW-SOFT. Please note the following:
The PEW Science Back Pressure Metric, Ω [Pa-1], may be generated for any silencer and suppressed weapon system using any suitable raw external overpressure signature data acquired 1.0 m left of the silencer end cap. PEW Science highly recommends data acquisition in accordance with The Silencer Sound Standard.
Omega Zones are presented in Table 2, below, which are intended to provide guidance to weapons developers, silencer designers, and end-users, with regard to flow restriction characteristics of different silencer designs. It is very important to note that silencers possessing a relatively high Ω can still provide functional use on weapon systems. Some weapon systems are more sensitive to Ω than others.
It is important to note that a silencer’s Omega Zone can shift when using a mounting scheme that differs from that used in the testing referenced in the published PEW Science Sound Signature Reviews. This phenomenon occurs due to some silencer mounting schemes significantly influencing flow restriction with some silencer designs.
The theoretical lower limit of flow restriction, or so-called "zero back pressure" would be represented by the unsupressed state, Ω = 0 [Pa-1].
PEW Science acknowledges that other dynamic events occur within a suppressed weapon system that can also influence weapon function. Therefore, PEW Science acknowledges that Ω is not the sole parameter one must consider for total supppressed weapon system operation. However, PEW Science postulates that the Ω metric influence can be significant. Note that weapon system influence is also a function of early-time wave propagation factors which may be measured inside the system, in close proximity to the muzzle orifice. These factors include the so-called PEW Science Alpha parameter; a subject of internal research.
The Back Pressure Metric relations are most easily viewed on a logarithmic scale (See Figure 6).
Figure 5. Omega Back Pressure Metric And Suppression Rating Comparisons Of .308 Rifle Silencers Using PEW-SOFT Data and Analysis
As stated above, the PEW Science Back Pressure Metric is most easily viewed on a logarithmic scale. The metric is nonlinear; the shape of the trend in the data presented in Figure 6, below, illustrates the potential thresholds of extreme flow rate (approaching the unsuppressed state) and extreme flow restriction (approaching the trapping of the maximum amount of combustion byproducts in a system).
Figure 6. Omega Back Pressure Metric Comparisons Of .308 Rifle Silencers Using PEW-SOFT Data and Analysis
Omega characterizes silencer back pressure. It is important to note that back pressure is not blow back. The back pressure of a silencer is the flow restriction it introduces in a suppressed weapon system. The blow back phenomenon that can occur during the use of a suppressed weapon system is caused by the reciprocating system actuating too early relative to overpressure decay within the weapon system, resulting in exposure of excessive internal system overpressure to atmosphere. Some weapons may be tuned to function well with silencers in a high Omega Zone. Some weapons may require low-Omega silencers due to constraints in their operating system(s). Omega metric technical details can be found in PEW Science Public Research Supplement 6.40.
Table 2. PEW Science Back Pressure Metric Omega Zones And Suppressed Weapon System Functional Descriptions
As stated above, weapon system influence is a function of both Ω and early-time wave propagation factors which may be measured inside the system, in close proximity to the muzzle orifice. These factors include the so-called PEW Science Alpha parameter; a subject of internal research. The Liberty Precision Machine Anthem-S2 QD possesses some blast chamber venting which most likely influences both early time shock reflections near the muzzle and late time momentum accumulation. Due to the overall design of the Anthem-S2 QD its Omega Metric is relatively high.
The Liberty Precision Machine Anthem-S2 QD performs on-par with, or even outperforms, high-performance silencers on this host weapon such as the Aero Precision Lahar-30L (6.112), Thunder Beast ULTRA 9 (6.24), CGS Helios QD (6.13), Silencer Central Banish 30 Gold (6.69), Rugged Surge (6.22), and Diligent Defense Enticer S (6.68). It is very interesting to note that the performance of this updated model is not significantly different than that of the previously evaluated Liberty Precision Machine Anthem-S (6.79). The Anthem-S2 QD may be considered a more refined version of the Anthem-S with somewhat more consistent combustion propagation performance.
PEW Science Research Note 6: Note that the delayed onset of initial wave reflections from the mount variation may be partially responsible for the nominal Omega Metric increase with the Anthem-S2 QD, over that of the Anthem-S. Further research is needed.
PEW Science urges the reader not to misconstrue a low Omega metric with the mirroring of unsuppressed weapon function, nor a high Omega Metric with absolute use prohibition on semi-automatic systems. Each weapon system may experience varying sensitivity to different Omega Zones and users may exhibit varying preference for weapon system function and operability. The Zones are provided by PEW Science to assist the reader with determination of postulated applicability of silencer types, as some users may only have experience with certain silencers. The Omega Metric is one performance indicator; it allows overall flow rate phenomena to be categorized independently from sound signature suppression performance. Note that weapon system influence is also a function of early-time wave propagation factors which may be measured inside the system, in close proximity to the muzzle orifice.
PEW Science Research Note 7: Like other silencers in the Mach and Anthem 2 series, the blast chamber venting of the Anthem-S2 QD may provide appropriate use condition on limited reciprocating systems, despite its significantly long blowdown duration. However, the applicability of the Anthem-S2 QD on such systems has not been evaluated by PEW Science. The user is encouraged to contact Liberty Precision Machine for additional information on that type of system applicability.
The user is encouraged to be mindful of the degree to which sound signature suppression, and resulting personnel hazards, can vary across designs. Small arm weapon system suppression performance is a spectrum. The PEW Science Suppression Rating and the Silencer Sound Standard help quantify this spectrum for end users and industry, objectively.
6.170.3 Review Summary: Liberty Precision Machine Anthem-S2 QD on a Savage Model 10 .308 with 20-in Barrel
When paired with the Savage M10 20” .308 and fired with Federal XM80, the Liberty Precision Machine Anthem-S2 QD with the ATLAS coupler and brake mount achieved a Suppression Rating™ of 46.9 in PEW Science testing.
The subsonic 300 BLK performance of the Liberty Precision Machine Mach-L with the same mount system is detailed in Sound Signature Review 6.170, in which it achieved a composite Suppression Rating of 68.4.
As with all weapon systems, the user is encouraged to examine both muzzle and ear Suppression Ratings.
PEW Science Laboratory Staff Opinion:
The Liberty Precision Machine Anthem-S2 QD is a mid-size 30 caliber rifle silencer that demonstrates extremely high suppression performance for its length. For a traditionally-manufactured system, the performance of the Anthem-S2 QD is an example of the upper echelon of staged design efficiency and consistency, applied to a mid-size system. The technology in the steel Anthem-S2 QD is also implemented in the titanium Mach series; the Anthem 2 series may be considered identical to the Mach series, other than construction material and included mount(s). Both Anthem 2 and Mach series silencers possesses user-adaptable mounting capability.
Significant and efficient pressure stagnation relief with accompanying downstream restriction is the primary combination of gross performance attributes in the Anthem 2 and Mach series from Liberty Precision Machine that produce the noted efficiency in the measured pressure field. The Anthem 2 series possesses more significant distal flow control than its previous generation, and while it exhibits very similar muzzle signature severity, has somewhat reduced operator risk, on average. The Anthem-S2 QD may therefore be considered a “more refined” version of the Anthem-S. At a total tested system length of 7.5 inches, the Anthem-S2 QD exhibits higher sound suppression performance on this weapon system, in totality, than any other silencer in the current Standard pedigree for the given length.
While reduced in performance compared with the longer Mach-L, the shorter Anthem-S2 QD performs on-par with, or even outperforms, high-performance silencers on this platform such as the Aero Precision Lahar-30L, Thunder Beast ULTRA 9, CGS Helios QD, Silencer Central Banish 30 Gold, Rugged Surge, and Diligent Defense Enticer S. Note that the relative FRP severity from the Anthem-S2 QD, on this weapon system, is significant to both the operator and to bystanders. Also note that this is a key difference between this silencer and silencers like the ULTRA 9 and Surge. Although the silencers perform similarly on average and therefore have similar Suppression Ratings, the FRP masking capabilities from the ULTRA 9 and Surge are more advanced than that of the Anthem-S2 QD.
The included brake mount is easy to install in the ATLAS coupler included with the Anthem-S2 QD, and possesses hex-wrench features on the exterior. The ATLAS coupler may be removed and other mounts compatible with the so-called HUB threading system may be installed. This feature allows the Anthem-S2 QD to be used with a variety of weapon systems.
In this review, the Liberty Precision Machine Anthem-S2 QD performance metrics depend upon suppressing a supersonic centerfire rifle cartridge; no easy task. PEW Science encourages the reader to remain vigilant with regard to all supersonic centerfire rifle suppression claims. The gas volume and combustion products created by the firing of the supersonic .308WIN cartridge are significant; the measured pressure and impulse magnitudes, and their durations, illustrate this fact.
The hearing damage potential of supersonic centerfire rifle use is significant. PEW Science encourages the reader to consider the Suppression Rating when deciding on an appropriate silencer and host weapon combination for their desired use.
