I am pretty sure your breachblock has been damaged and some attempt made at repair.
This is pretty common with barrel replacements & parts guns, the extractor is pushed up to the point that it tears the top of the breachblock open after a few rounds.
So head spacing may be an issue, also too hot of ammunition can do the same as well as a bent ejector.
I will let others jump in as I dont do gunsmithing much anymore but I am pretty sure this is what your dealing with.
Shooting the gun will likely cause more damage--some serious caution is suggested
Vern
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