The KRISS Mag-Ex Kit 2 is the ultimate capacity extending base plate for your factory standard Glock magazines. The KRISS Mag-Ex Kit 2 is made up of the extended baseplate outer sleeve and extended spring constructed of durable and lightweight reinforced composites. Combining the Mag-Ex Kit 2 with the factory standard Glock magazine body and follower is a perfect match of reliable feeding toughness and aesthetics for the KRISS Vector. The Mag-Ex Kit 2 is available in 9mm and 10mm and designed for standard capacity G17 and G20 magazines for an overall capacity of 40 rounds of 9mm and 33 rounds of 10mm for your KRISS Vector Glock handgun and your Glock magazine-compatible pistol caliber carbine.