Pearce grip's magazine extension adds capacity to mid and full size glock high capacity magazines.It replaces the original floor plate and internal locking plate and adds two rounds to a 9mm; two rounds to a 40sw and 357sig, and one round to a 45gap magazine.

Caliber: 9mm Luger/40 Smith & Wesson (S&W)/357 Sig/45 GAP
Capacity: 2rd (9mm,40 S&W,357 Sig) 1rd (45 GAP)
Finish: Black
Model: Magazine Extension
Material: Polymer
Type: Magazine Extension
Model Fit: Mid & Full Size
Brand Fit: Glock
Capacity: 2 (9mm,40 S&W,357 Sig) 1 (45 GAP)