The BMP-23 pistol is a reborn Gwinn Firearms design Bushmaster arm pistol from the early 1970’s. It’s 5.56 caliber with an 11.5″ barrel and AK-47 type gas piston operating system. This lightweight aluminum and steel design weighs in at 5.2 Lbs and has built in iron sights. There’s also a unique 40-degree swivel design for right- and left-hand use.