The KRISS Mag-Ex Kit 2 is the ultimate capacity extending base plate for your factory standard Glock magazines. It 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. It can be used for your KRISS Vector, Glock 17 handgun, and your Glock 17 magazine-compatible pistol caliber carbine.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 designed for standard capacity G17 magazines for an overall capacity of 40 rounds of 9mm for your KRISS Vector, Glock handgun, and your Glock magazine-compatible pistol caliber carbine.