I'll agree with Don Glock, none of those parts would cause failures to feed or failures to eject(stovepipes) unless you're accidentally actuating the mag release which causes the magazine to sit lower in the gun or accidentally pushing the extended slide stop up into the slide with recoil during firing which would slow down the slide's velocity.
UMC ammo is crud. Try some American Eagle, if your Glock malfunctions with American Eagle you know the problem isn't the ammo.
UMC ammo is crud. Try some American Eagle, if your Glock malfunctions with American Eagle you know the problem isn't the ammo.
