PSA AR 9mm Magazine Insert

Palmetto State Armory 9mm Magazine Insert block.  For use in AR-15 lowers, converts lower to use 9mm colt-style magazines.  Installs from the top of the receiver before installing bolt catch.  If retrofitting to a built lower, the bolt catch will have to be removed to install the magazine block, and reinstalled after block is fitted.  Magazine block fits snugly in the mag well, may need to be tapped in using a wood or delrin block to keep from damaging the ejector.