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Is the buffer end of the bolt a C shape or a full circle? It looks like you have a post ban Colt lower with the AR15/M16 bolt block. Behind the hammer is there a rectangle that says "Colt"?My apologies for the error, not the wisest to gun specs and was told by an interest buyer it was an A1. I posted a picture of the bolt, I hope that helps answer your question.
View attachment 50862
Why is it there?