Molded polymer cover fits in the underside of a disassembled .22 LR conversion upper receiver to prevent the bolt from falling out. Keeps dirt and debris out of internal components, too. Slide over the takedown and pivot pins, then secure in place with the two included cotter pins. Can be installed on any disassembled centerfire upper as well to protect the bolt carrier.
SPECS:
Polymer, black. Fits AR-15/M16/M4 upper receiver and .22 LR conversions.
Catalog page 9