The Velos LBP 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 7.62 accommodates calibers up to .30 caliber and is compatible with SilencerCo's Charlie accessories while having no barrel length restrictions. Specifications: Caliber Compatibility: .223rem/5.56 NATO to .300 Rum Accessories: Charlie & ASR Weight: 16.5oz Length: 6.4" Diameter: 1.73" Materials: 17-4 Stainless Steel & Inconel 625 Muzzle Average: 5.56 NATO = 137.1dB .300blk = 127.1dB .308win = 138.5dB Ships With: Internal Charlie Flash Hider Front Cap Charlie ASR Mount ASR Muzzle Device Spanner Wrench Charlie Tool