Glock OEM (factory) current production +2 magazine extension will add 2
rounds to all the standard (hi-capacity) 9mm.
Adds 1 round to 45 GAP, 40S&W, 357SIG magazines
Fits all Full Metal Lined (FML) magazines.
Works great for G26,27 & 33 magazines. Includes 1 extension and 1 insert.
Does not fit Non Full Metal Lined (NFML) early production magazines.
Does not fit 45ACP or 10mm magazines. Will not add 2 rounds to any of the reduced capacity (Clinton) 10 round single stack magazines. 10 round G26 mags work fine.
Part number 36 on the Glock Schematic.