The Velos LBP K uses a low back-pressure technology to reduce overall blowback while maintaining impressive sound suppression. The Velos LBP K is constructed of a 3D printed inconel 625 core fully welded to 17-4 stainless steel front and rear modules making this product unlike anything else on the market. It is also full-auto rated and the most durable suppressor SilencerCo has ever made. Ships with an Internal Charlie Flash Hider Front Cap a Charlie ASR mount ASR Flash Hider in 1/2 x 28 a spanner wrench and a Charlie tool.