Molded polymer cover fits in the underside of a disassembled AR-15 .22 conversion upper receiver to prevent the bolt from falling out and keep dirt and debris out of internal components. Can be installed on any standard centerfire upper as well to protect bolt carrier cover. Slide over front and rear take-down pins, then secure it with the two cotter-style push pins.
Keeps Debris Out & Prevents .22 LR Bolt From Falling Out Of Disassembled Receiver.
*Will work on any AR upper, any caliber, not just .22's.