Radian Vertex Trigger Flat Bow 111201 the MAG HOLDER is built the MAG HOLDER is built to withstand rigorous use while keeping your magazines secure 9oz 167g Caliber up to 338 Materials 17 4 heat treated stainless steel Coatings C Series Cerakote matte black Mounts compatible with all HX QD muzzle brakes and flash hiders up to 338 No barrel length restrictions Durability exceeds 6 SOCOM test cycles 1 cycle equals 8x30 round magazines Maintenance occasional cleaning with focus on threads recommended TR Level 9 fully developed and in production This multi caliber blast deflector is constructed with 17 4 stainless steel and is compatible with all HUXWRX HX QD Muzzle Brakes and Flash Hiders (up to with a design that prevents pin walkout even when using standard hammer and trigger pins enhancing the shooter’s ability to make a straight back trigger break