SSS.8.1.23 - Suppressed AR-15 Rifle Hazards - Rampart Range Suppression Carson 556 Silencer Hazard Map Brief
/Rampart Range Suppression Carson 556 on the MK18 5.56x45mm 10.3-in Barrel Automatic AR15 Rifle - Hazard Map
This Silencer Hazard Map Brief documents the free field blast overpressure hazards from the Rampart Range Suppression Carson 556 rifle silencer fielded on the 10.3-in MK18 AR-15 semiautomatic rifle firing M193 55gr 5.56 NATO ammunition, as evaluated in technical Report 6.226 and as tabulated in record number 7.1.261 in the Rankings.
The average Suppression Rating hazard contours at 1.6 m silencer end cap elevation from the instrumented blast test of the Carson 556 silencer computed with the PEW-SOFT HD Blast Hazard Prediction Tool are shown in Figure 1. The Suppression Rating hazard scale is shown in Figure 2. Ground-truth anchored Suppression Ratings from the technical report are annotated 1.0 m left of the end cap (SR_muzzle) and 6 inches right of the shooter’s right ear (SR_ear). Computational parameters and blast overpressure hazard field observations are provided below.
8.1.23.1 PEW-SOFT HD Computational Model Parameters
PEW-SOFT HD code Version 2.2.7 Alpha was used.
Contour elevation is 1.6 m above grade. No reflecting surfaces, other than the ground, are present in the model.
Grid resolution is 0.076 m (3 in).
The average semiautomatic jet stability index sigma_sa of the silencer is 0.46.
8.1.23.2 Rampart Range Suppression Carson 556 Suppression Hazard Map Observations:
The Rampart Range Suppression Carson 556 silencer is a high performance hybrid design utilizing an Infinity core derivative with high early time flow rate and controlled late time flow rate. Blast load input into the silencer is relatively high amplitude from the 10.3-in rifle barrel. Blast load output from the silencer is highly controlled, with relatively stable jetting.
Near-field severity forward of the operator is moderate. Near the operator, risk is somewhat reduced due to the significant muzzle blast suppression. The early time flow rate from the silencer is high enough such that ejection port blast hazards are reduced. Further hazard reduction is possible through weapon tuning.
The hazard field from the Carson 556 system is consistent, from shot to shot. First-round-pop (FRP) hazards are somewhat reduced when compared to a native Infinity silencer due to modifications to the first and last expansion chambers.
fig 1. Rampart Range Suppression Carson 556 10.3-in MK18 AR-15 Free Field Hazard Map Produced by PEW-SOFT HD Blast Hazard Prediction Tool using PEW Science Test Data
Fig 2. PEW Science Suppression Rating Scale
