Pearce PG-GP Plus Extension. For use on all standard capcity FML Glock magazines only. This extension will increase the capacity of the 9mm mags by 3 rounds, the 40/357 cal mags by 2 rounds and the .45 GAP mags by 1 round.
This unit will not fit the 10mm or 45ACP mags or 10 round G17, 19, 20, 21, 22, 23, 31,32 mags.
NOT FOR USE WITH GLOCK 43 MAGAZINES