Pearce Grip's Plus Extension replaces the magazine base plate and internal floor plate. It will add two rounds to the Glock 26, one round to the Glock 27/33 and no rounds to the Glock 39. It will also add 5/8" additional length for better control and comfort.
Specifications:

Caliber	9mm Luger/40 Smith & Wesson (S&W)/357 Sig/45 GAP
Capacity	2 rd (9mm), 1 rd (40 S&W/357 Sig)
Finish	Black
Model	Plus Extension
Material	Polymer
Type	Detachable
Model Fit	G26/27/33/39
Brand Fit	Glock
Max Capacity	2