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Do you think with the receiver apart you could get a barrel liner drill (8mm diameter) down the bore or would the rear of the receiver be in the way? I'm wondering if it's possible to line the bore of one of these without removing the barrel.
I think you could probably drill with the barrel attached. I don't think you could finish the extractor cuts/ chamber face's bevel. Reading on other forums, 12's are tricky to reline even with the barrel off due to the shape.