The KRISS MagEx2 Kit is the ultimate capacity extending base plate for your factory standard Glock magazines Gen 3 and later. It is made up of the extended baseplate outer sleeve and extended spring constructed of durable and lightweight reinforced composites.This kit combines with the factory standard Glock magazine body and follower to provide reliable feeding toughness and aesthetics similar to the KRISS Vector. The MagEx2 Kit is caliber-specific and available in 9mm 10mm and .45ACP designed for standard capacity G17 G20 and G21 magazines.When used with a Glock 21 magazine the MagEx2 Kit increases the overall capacity to 30 rounds of .45ACP. This kit is compatible with your KRISS Vector Glock handgun and your Glock magazine-compatible pistol caliber carbine.Features:- Includes extended baseplate outer sleeve and extended spring- Adds 17 rounds to the standard Glock 21 magazine for a total of 30 rounds- For Kriss Vector/Glock 21- Constructed from durable/lightweight composite polymer- Reliable feeding and toughness