This is a genuine factory GLOCK 21 magazine designed to work in all previous versions of the GLOCK 21 including the new Generation 4. It features the double cut magazine body and will work if you have reversed your magazine release on your Gen 4 GLOCK 21. The magazine is constructed from black polymer, and has a metal spring.
Specifications and Features:
10 Round Capacity
GLOCK Factory Part
Generation 4 compatible with double cut body