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 5.56 suppressor is dedicated for .223rem/ 5.56 NATO calibers and 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. Minimizing Back Pressure- Improving the Shooting Experience: The Velos LBP was designed with low back-pressure technology to reduce the amount of gas that is blown back into the shooter's face and affects the host firearm's operating system. At the same time, it maintains impressive sound suppression, setting it above the competition. Unmatched Durability: Constructed of 17-4 stainless steel and a 3D printed inconel 625 core. Charlie Mounts: Pairs with Charlie ASR Mount, Charlie Direct Thread Mounts, and ASR Muzzle Devices. 3D Printed Technology: The Velos LBP incorporates newer manufacturing processes with a 3D printed inconel 625 core fully welded to 17-4 stainless steel front and rear modules. The Most Durable Suppressor SilencerCo has Ever Made: The Velos LBP is SilencerCo's most durable suppressor due, in part, to the inclusion of their patented Hoplon blast baffle. This blast baffle deflects debris, increasing the lifespan of the suppressor on short-barreled and full-auto firearms. To top it off, SilencerCo used V-Series Cerakote to make sure that the finish will hold up to extreme use. Specifications: Caliber Compatibility: .223rem/5.56 NATO Accessories: Charlie & ASR Weight: 15.2oz Length: 5.98" Diameter: 1.73" Materials: 17-4 Stainless Steel, Inconel Muzzle Average: 5.56 NATO = 137.1dB