This is a M4 22 LR rimfire Upper Conversion Kit that is Mil-Spec sized for the use with AR-15/M16 firearms. The Kit features complete upper with a barrel designed specifically for 22 LR. ammo. It includes all necessary parts for converting your existing caliber to the inexpensive .22 LR. rimfire. The conversion takes less than one minute and is achieved with no permanent alterations to your firearm. It also included (2) 28 round mags.
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