Pictures would really help, also if you could post exactly what is stamped on the gun and the serial number range that could help also (x out the last two digits if you do not wish to post the whole serial number). I was not aware that the 29-A's had different firing pins, I have changed a few and never had a fit problem, but I have not compared any from different years and Savage had a habit of changing parts.
I do not believe any house brand pumps were made after WWII so even though it has a round barrel it would be early 40's at the latest - some house brands had round barrels going back to the 30's.
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