The Velos LBP is SilencerCo s answer for customers seeking optimal performance from a 5.56mm silencer. It uses a low back-pressure technology to reduce overall blowback while maintaining impressive sound suppression. The Velos LBP 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. The Velos LBP is a dedicated .223 REM / 5.56 NATO suppressor, compatible with SilencerCo s Charlie accessories and it has no barrel length restrictions. It ships with an Internal Charlie Flash Hider Front Cap, a Charlie ASR mount, an ASR Flash Hider in 1/2 x 28, a spanner wrench, and a Charlie tool. Product Specifications Caliber Compatibility: .223 REM/ 5.56 NATO Accessories: Charlie & ASR Weight: 15.2 oz Length: 5.98 Diameter: 1.73 Materials: 17 4 SS, Inconel Muzzle Average: 5.56 NATO: 137.1 dB Ships With: 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.