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 to .300 RUM – Accessories Charlie & ASR – Weight 16.5 oz – Length 6.4 – Diameter 1.73 – Materials 17-4 SS Inconel 625 – Muzzle Average 5.56 NATO: 137.1 dB .300 BLK: 127.1 dB .308 WIN: 138.5 dB – Ships With Ships with an Internal Charlie Flash Hider Front Cap a Charlie ASR mount ASR Muzzle Device a spanner wrench and a Charlie tool.