"K31 Threaded Muzzle Brake: K31 Threaded Muzzle Brake: This brake is designed specifically for the K31 rifle and shows an effective range to 30% reduction of felt recoil, which makes it THE most effective .30 caliber rifle brake on the market. Intended for use on a K-31 that has been threaded to accept it with the 14mmx1 Threading Kit sold separately. |