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I have a one bolt stock on a Greek return Rock Island. Some rack numbers on the butt and a repair, looks like a L at the tip. No other markings but in excellent shape

Yes they are interchangeable.

My barrel is also stamped C131. Hope this helps. I also have a straight handled bolt with a C on the bottom of the safety lug and a 1 and punch on the handle. I did not see this marking in your list...

I have a RIA 5-22 with a small P under the date stamp the receiver is RIA 330385 this was a barreled receiver from the last CMP offering. If you are interested in the seel lot code I can get that for...

Thanks for the information. I have a stock that I can try that on. Not as bad but something new to try.

Chuck

I would be interested in knowing how you repair the crack in the second stock, or can it be repaired back to a shooter.