Scherer Glock 27/33 Magazine Extension Fits 9MM/40SW/357 Sig/10MM/45 ACP

These extensions will add 1 round of ammunition to your pre ban FML drop free magazine. The extensions include an "L" shaped insert to replace the Glock locking plate. They fit the various 9mm, 40 S&W and 357 SIG. For use in pre ban high capacity magazines only.