Easy fix is to put a bevel on the mouth of the chamber of the barrel like they do with AR15/M16 barrels. I don't recall the spec's, but I'm sure it's out there somewhere. Here's a couple pic's of what I'm talking about.
This bevel has been used on every single M16 barrel ever put into service so there's no safety concern to worry about. Basically it acts as a secondary feed ramp to help guide the bullet into the chamber (often necessary when using flat-nosed or hollow point bullets).
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