Just like the MFour-22 rifle the Chiappa M4-22 Upper Receiver Kit takes advantage of AR platform dimensions and geometry. These upper receivers will fit on any MIL-SPEC lower receiver to create a .22LR rifle perfect for plinking or training. - Caliber: 22 Long Rifle - Action: Semi-Auto - Barrel Length: 16 - Capacity: 28 - Feed In: Magazine - Forend: Quad Picatinny 11.8 - Weight: 4 lbs - Length: 23.6 - Material: Polymer w/ Steel Barrel - Finish: Matte Black - Notes: Includes 2-28 Round Magazines