Rugged Razor 556 (Black). Dedicated 5.56mm suppressor designed for reduced blowback, recoil, and flash. 13.4 oz. Machined from 17-4 stainless steel bar stock with full-circumference welded Cobalt 6 alloy baffles for extreme heat and abrasion resistance. Dual Taper Locking System provides concentric lockup, repeatable zero, and carbon-free threads. Reduced gas blowback for semi-auto and full-auto platforms. Belt Fed Rated with no barrel length restrictions. Removable front cap with flash hider front caps available. 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