Mac-10 clone Masterpiece Arms . 45 ACP Defender. Comes with original case and 4 pre-ban 30-round magazines. Rifle configuration, adapted for AR style stocks. Also has been adapted for AR style quad rails, and comes with a Samson quad rail. In the side-cocking configuration with a top rail for reflex sight or other optic. Also has a muzzle break pinned and welded to the barrel. Less than 50 rounds shot through the rifle. VERY IMPORTANT! Only cycles +P rounds efficiently! Very little recoil even with high pressure loads, lots of fun at the range.