On the left is real Glock mag with the round properly sitting between the feed lips and to the rear of the magazine. On the right is the probably Tonk made as well SGM fagazine with the ammo not touched on either side by the feed lips and sitting farther forward, just loose enough and far forward enough that almost every damn round misfeeds and slams into the barrel below the chamber forcing the bullet deeper into the case.
So in short they are pieces of crap just like the KCI magazines where you need to buy 100 of them to get 10 that feed right. If only they spent another ten cents and got their metal insert right as well as their injection mold set up right but I guess that is too much to ask for a $20 magazine.
