The Tokarev TBP-12M AR platform semi-automatic Bullpup shotgun uses a conventional gas-operated action which is located around the support tube that runs below the barrel.  The upper receiver is manufactured from an aluminum alloy while the lower receiver, pistol grip, and stock are manufactured as one piece from impact-resistant polymer.  The AR-12 Bullpup Shotgun comes with one 5+1 metal detachable magazine.  The top of the receiver has an integral Picatinny rail for mounting rear sights or any optical accessories. The AR-12 12-gauge bullpup shotgun is appropriate for all levels of hunting and sporting enthusiasts. Comes packaged in a nice commercial box with 1 mag and a manual. Includes removable front and rear flip-up sights. Chambered for 2 3/4″ or 3″ Magnum loads. These are just really cool.  This is the M model meaning that is features the highly popular marine grade nickel finish.