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Old February 22, 2013, 11:00 PM   #6
James K
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Join Date: March 17, 1999
Posts: 19,979
Since the grip frame of those Ruger .22 autos is made from stamped steel (two "clam shell" halves welded together, like the M3 SMG), it would be hard to stamp a serial number on it wiithout smashing it flat. So Ruger asked (then) ATTD to put the serial on the receiver, and that is where it is today.

I understood the OP's question to be about changing barrels keeping the receiver. If the intent is to buy a new upper (barrel and receiver), the swap would be easy.

Jim
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