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mbr:
As long as the lifter isn't touching the shell, it's OK, and I wouldn't file anything.
Unstaked latches will, or won't cause problems, depending on the gun.
The critical dimension seems to be the fit between the receiver and the trigger group.
If the fit is a little loose SOME guns will malfunction due to the unstaked latches shifting.
You have to keep in mind, that the latches ARE springs, and if the rear end isn't firmly anchored, you can get mis-feeds.
As long as you have a snug fitting trigger group, and the gun is proven to operate properly, it may not be "right", but if it works, it works.
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