Yes there is a small hole to let gas out and yes it's a cock on closingMy guess and its just a guess is that its a model 1916 Spanish mauser. I say that because of the bent bolt (if original and not bubba) and the blank receiver with no markings or crest. The Spanish reworked most of their rifles at different points and scrubbed the original markings off, usually just putting new serial numbers on the rifle.
Without more pictures its hard to tell. Is there a small hole to let gas escape on the left side of the receiver? Is the bolt cock on close or cock on opening? If its cock on closing, you should feel a slight resistance when closing the bolt like on an enfield.
Yes there is a small hole to let gas out and yes it's a cock on closing
Based on that, it should be a model 1916 mauser
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