Energetic Armament Vox K2. Compact "kurtz" silencer. Laser welded and nitrided C300 nickel-cobalt superalloy core. Weight: 10.4oz. Length: 4.9". 1.375x24 HUB mount interface with removable direct thread adapter. Standard wipe cap (usable with or without wipe). Accepts accessory flash hider end caps in 7.62mm and 5.56mm. Patented Serial ID ring for same-day warranty re-cores. 60% better weight efficiency (dB/oz) at muzzle and 25% at ear vs legacy Vox K (tested on Mk18). Includes combination cap/mount spanner and VOX Blox vise block. Lifetime warranty. 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