The Ghost Inc® MOAB +6 Magazine Extension for Glock® 17/22 Pistols is an aftermarket mag extension baseplate and adds +6 rounds to your compatible Glock magazine. This baseplate features a stainless steel extra power magazine spring and boasts polymer construction. It ensures positive mag seating and has an ergonomic design with extraction points and debris extraction ports. Compatible with Glock 17 and 22 pistol magazines. Does NOT work with 10-round Glock mags. Backed by a lifetime warranty from Ghost Inc. Made in USA.