This is the Magpul PMAG 10 GL9™ 10 round 9mm magazine for the Glock 17 and rifles using the Glock 9mm format.
A restricted capacity model for ranges and locations with magazine capacity restrictions.
Compatible with all Glock 9mm pistols and 9mm carbine rifles. Flush fit on Glock 17, sticks out a bit on Glock 19.