The SilencerCo Velos LBP 5.56 delivers optimal performance with low back-pressure technology to reduce blowback while maintaining exceptional sound suppression. 3D printed Inconel 625 core fully welded to 17-4 modules. Full-auto rated, the most durable suppressor SilencerCo has ever made. Compatible with Charlie accessories, no barrel length restrictions. Ships with Internal Charlie Flash Hider Front Cap, Charlie ASR mount, ASR Flash Hider 1/2x28. Note: If this product is reflected as in-stock it means it's either physically in-stock or allocated and available (serial number is assigned) at my distributor