Magazine works as advertised, may need modification - Elite Tactical Systems Carbon Smoke Series Glock 17/18/19/26/34/45 9mm Luger 40 Round Pistol Magazine

the magazine works but i used it on a mac 11 upper/bolt and the bolt would catch on the magazine follower when the last round was fired. I cant say how it performs in a standard glock or ar15. i find the magazine follower to be of lower quality than the OEM glock follower or other followers such as pmag because it pushes up farther and a bit past the magazine lips. i had to take a file and smooth out the rear side of the follower to angle so that the bolt would not catch on the follower. its easier to disassemble that the OEM glock magazine with is good. i would buy this magazine again over spending money on a kriss vector 40 round magazine or kriss vector conversion kit.