The KRISS Mag-Ex2 extended magazine is a fully assembled Mag-Ex Kit 2 with a factory standard Glock Magazine. The Mag-Ex 2 is the perfect match of reliable feeding" toughness" and aesthetics for the KRISS Vector. The Mag-Ex 2 is available in 9mm and 10mm; 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.