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. Options include the Velos LBP 5.56 Velos 5.56 K and Velos LBP 7.62. - The Velos LBP 5.56 and 5.56 K suppressors are dedicated for .223 REM / 5.56 NATO calibers while the Velos LBP 7.62 accommodates calibers up to .30 caliber. All are compatible with SilencerCo's Charlie accessories and have no barrel length restrictions. - The Velos LBP 5.56 ships with with an Internal Charlie Flash Hider Front Cap in .223 a Charlie ASR mount an ASR Flash Hider in 1/2 x 28 a spanner wrench and a Charlie tool. The Velos 5.56 K ships with an ASR Mount an ASR Closed-Tine Flash Hider an Internal Charlie Flash Hider Front Cap in .223 a basic tool and a Charlie tool. The Velos LBP 7.62 ships with a .30 caliber muzzle brake the Charlie ASR Mount an Internal Charlie Flash Hider Front Cap in .30 caliber a Basic Tool and a Charlie Multitool. - Features - Low backpressure- reduces blowback on AR-15's for more fun at the range. - Compatible with belt-fed machine guns. - Uses 3D printed technology and stainless steelmaterials for unmatched durability. - No barrel restrictions - Caliber Compatibility .223 REM/ 5.56 NATO - Accessories Charlie & ASR - Weight 12.4 oz - Length 4.76 - Diameter 1.73 - Materials 17-4 SS Inconel 625 - Muzzle Average 5.56 NATO: 149.8 dB - Ships With 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.