The Combat Application Technologies CAT ST is a full-size 5.56 rifle silencer intended for use on all common weapon system barrel lengths. Its suppression performance may be considered “state of the art,” and is extremely high relative to other systems on the current market. There exist no other silencers evaluated by the PEW Science Laboratory, as of the date of this publication, that exhibit the levels of pure suppression performance measured from the CAT ST on the M4 weapon system. The silencer is available in both 3D printed Inconel and Titanium models, in both QD or HUB-compatible variants. While the silencer has higher effective back pressure and first-round-pop (FRP) relative to previous generation CAT silencers, its FRP and flow rate performance are still strongly competitive with the rest of the market.

In this review, the CAT ST performance metrics depend upon suppressing a supersonic centerfire rifle cartridge on a commonly fielded gas-operated rifle, which is an incredibly difficult task. How would the CAT ST perform on your M4 with a 14.5-in barrel?