The SilencerCo Velos LBP 7.62 uses low back-pressure technology to reduce blowback while maintaining impressive sound suppression. Constructed of 3D printed Inconel 625 core fully welded to 17-4 stainless steel modules. Full-auto rated and the most durable suppressor SilencerCo has ever made. Accommodates calibers up to .30 caliber. Compatible with Charlie accessories, no barrel length restrictions. Ships with .30 cal muzzle brake, Charlie ASR Mount, Internal Charlie Flash Hider Front Cap. Note: If this product is reflected as in-stock it means it's either physically in-stock or allocated and available (serial number is assigned) at my distributor