The one that is giving me trouble is a Magpul. The other Magpul that I have works perfectly.
The one that is causing problems seems to not raise the cartridge high enough, so the bolt will travel right over the top of it instead of scraping into the firing chamber, and this causes minor damage to the surface of the bullet and its casing on top of jamming the rifle.
I’m not sure if the damage is severe enough to make the bullet dangerous to fire after clearing it, but I have not tried to fire on of these, so it basically wastes a round each time this happens.
Toss it.
You cannot effectively add material to the lockup.
I have an AK in 223 like that.
Wont lookup E German Mags, consistently so, the problem is the mag catch needs replaced and fitted.
You have one rogue mag.
Smoking frog saw my AR do that once.
It locked up solid, I said yer the AR guy, have a look at this.
After mush cursing he said when was the last time you cleaned this thing?
I said 2500 rounds ago, its an endurance test :)