This conversion includes the complete upper and one 28 round magazine. It is compatible with any Mil-Spec AR lower!

Caliber: .22 LR - Capacity: 28rd - Barrel: 16 - Don't let the ever increasing cost of ammunition prevent you from enjoying your favorite AR-15 / M-16. Chiappa Firearms .22 conversion allows you the opportunity to shoot inexpensive 22 rimfire ammunition for training or just for fun! The M4-22 Rimfire Conversion contains all the parts necessary to change your AR-15 / M-16 from it's existing caliber to the inexpensive .22LR rimfire cartridge.The conversion takes less than a minute and is achieved with no permanent alterations to your firearm. It can be quickly returned to it's original caliber. - The M4-22 Conversion allows semi-auto .22LR fire in ANY mil-spec AR firearm platform. This is a complete upper with a barrel designed specifically for .22 LR ammunition don't risk damaging your centerfire 5.56 barrel with lead bullets or settle for poor performance due to a fast twist rate. The design allows for the use of any Atchinson style conversion magazines to be used.