FIND IT HERE! https://doublemdefense.com/product/pearce-grip-pgg42733-magazine-extension-grip-extended-compatible-w-glock-26-27-33-black-polymer/ 

Factory New.

UPC: 605849200460
SKU: 605849200460

Item Description:

Pearce Magazine Extension Grip will add two rounds to the Glock 26, one round to the Glock 27/33 and no rounds to the Glock M39. This units will add 5/8" additional length for better control and comfort. *Note- only for magazines equipped with double notches for the ambi magazine release (Gen 4&5 magazines).

Item Specifications:

Brand Pearce Grip
Category Magazine Accessories
Model Magazine Extension Grip
Color Black
Material Polymer
Style Extended
Compatible With Glock 27