KRISS MagEx2 9mm and 10mm Glock Pistol Magazine Extensions: Bump Your Ammo Capacity Up to 40 Rounds and 33 Rounds! (Video!) – DefenseReview.com (DR): An online tactical technology and military defense technology
KRISS MagEx2 Extended Baseplate for Glock Standard Magazine - KRISS USA
ZEV Technologies Extended Mag Base Pad Glock 17 22 24 34 35 9mm Luger
SLR Rifleworks - Success with the new +5 10mm Glock Mag Extension. Sounds easy but it was a bit of a process. Should be available very very soon. Glock 20/40 Magwells coming
PEARCE+GRIP+PG-1045%2B+Magazine+Extension+for+GLOCK+29%2F20%2F21%2F40%2F41 for sale online | eBay
SGM Tactical 10mm 30 Round Magazine for Glock 20, 29 Pistols | The Mag Shack