PTAC 5.56 Bolt Carrier Group and 22LR Conversion Bolt Carrier Group

5.56 BCG:  Complete AR-15 bolt carrier group made of 8620 steel. Full auto profile chrome lined carrier. Gas key chrome lined and staked. 22LR BCG:  Convert your 5.56 AR-15 rifle into a .22LR. The conversion takes seconds and is as easy as swapping the bolt carrier group.  It allows the use of inexpensive .22LR ammunition in place of 5.56x45mm ammunition.  Stainless steel construction.  For use with Ciener-style magazines.