I acquired a Mark II receiver (5.5 bull barrel) awhile back. I have a chance to get reasonably priced 1970 RST. How much trouble would it be to get match them up?
may just go together and not have to be fitted. if it requires fitting Tactical Solutions , on their web site, has a decent set of instructions on how to fit a receiver to a grip frame. The instructions are for the aluminum upper but you can fit a steel receiver the same way.
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