Arredondo checkered Glock magazine extension fits Pre Ban Hi-Capacity FML (Full Metal Lined) and NFML (Non Full Metal Lined) magazines. Virtually unbreakable and extremely secure. Easily installed or removed with supplied "U" tool. You are purchasing a complete kit which includes: Extra power spring, take down tool, extension sleeve and base pad.
Adds the following round count:
+5 for Glock M/20
+4 for Glock M/21
*USPSA Limited Class Legal! Extends M/20,21 magazines to 140mm.