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 intended for the G17 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. DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.