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. Ships with an Internal Charlie Flash Hider Front Cap, a Charlie ASR mount,ASR Muzzle Device, a spanner wrench, and a Charlie tool. Model: Velos LBP Caliber: 7.62mm Color: Black Material: Inconel 625 Length: 6.40" Diameter: 1.73" Thread Pattern: 1/2"x28 Weight: 16.50 oz Accessories: Charlie & ASR