Black 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.
+6 for Glock 9mm M/17, 17L, and 34
+5 for Glock 40 S&W M/22, 24 and 35
+5 for Glock 357 Sig M/31
+3 for Glock 37 45 GAP
*USPSA Limited Class Legal! Extends M/17,22 magazines to 140mm.