The KRISS MagEx2 Kit is a premier capacity extension accessory designed for factory standard Glock magazines applicable to Gen 3 and later models. This sophisticated kit includes an extended baseplate outer sleeve and an extended spring all crafted from durable lightweight reinforced composites. When paired with the original Glock magazine body and follower the MagEx2 Kit ensures dependable feeding robust durability and a seamless aesthetic fit for the KRISS Vector.Specifically designed to cater to different calibers the MagEx2 Kit is available for 9mm 10mm and .45ACP. It is compatible with standard capacity G17 G20 and G21 magazines enhancing overall ammunition capacity to 40 rounds of 9mm 33 rounds of 10mm and 30 rounds of .45ACP. This makes it an excellent upgrade for your KRISS Vector Glock handgun and other Glock magazine-compatible pistol caliber carbines.