Glock OEM (factory) current production +2 magazine extension will add 2 rounds to all the standard (hi-capacity) 9mm, 40 S&W, 357 Sig. magazines.

Adds 1 round to 45 GAP magazines.

Fits all Full Metal Lined (FML) magazines.

Works great for G26,27 & 33 magazines.

Includes 2 extensions and 2 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 magazines.