I really like my 9MM AR-15 but sometimes have trouble with it cycling the next round. Seems like the next round gets slammed into the breach face instead of going into the firing chamber. I thought at one time it was my reloads but at the gun range yesterday was shooting new ammo although I'll admit the cheap Winchester ammo that Walmart sells. I still had the problem but appeared to be in the magazines. I have a 15 shot Glock and 30 shot Glock and another 30 shot no name magazine I bought at gun show in Florida. Right away I figured the problem was the gun show magazine. But it turns out it is the 30 shot Glock, the 15 shot Glock works perfect. Took some precision measurements in the shop and the 9mm round rides lower in the 30 shot Glocks magazine. Even a bench test proved this magazine would not feed correctly. I figure no way to move the latch but after some quick measurements found where the bullet grip area was held .030" smaller than the other magazines thus holding the bullet farther down in the magazine..
I broke out my little die grinder and hand ground the metallic bullet gripper on the magazine, about .015 on each side. I loaded a couple of bullets to the magazine and could plainly see the bullets were higher and closer to the center of the breach. Cycling by hand the magazine feeds perfect. I'll know for sure at the gun range Saturday.
Is it normal to tweak a magazine like that?
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