What's in the Box Ruger Mark IV 22/45 Lite 22LR Semi-Auto Pistol (2) 10-Round Magazines Cable Lock Owner's Manual The Mark IV 22/45 Lite features a simple, one-button takedown for quick and easy field-stripping and proper chamber-to-muzzle cleaning. Pressing a button in the back of the frame allows the barrel-receiver assembly to tilt up and off the grip frame without the use of tools; a lightweight, ventilated, aerospace-grade aluminum receiver and a tensioned stainless steel barrel; ergonomic bolt stop; adjustable rear sight and a factory-installed Picatinny rail for easy mounting of optics; ambidextrous manual safety can be converted to left-side only with included washer; push-button magazine release on the left side of the frame and magazine disconnect prevents discharge when the magazine has been removed. Includes two 10rd magazines. Firearm Features Ambidextrous Safety Fixed Front / Adj Rear Sights Picatinny Rail Firearm Specifications Manufacturer: Ruger Model: Mark IV 22/45 Lite Caliber: 22LR Barrel Length: 4.4" Twist Rate: 1:16"RH Finish: Black/Gray Magazine Capacity: 10 Rounds