Most .22 rifles and shotguns (and many other guns) had no serial numbers prior to 1968 when the law made factory serial numbers mandatory. (I have several guns with no serial numbers, including a "Liberator" pistol.)
At that time, a lot of companies dropped their cheaper or low volume guns because it would have cost too much to put serial numbers on them and keep the required records.
That why the law makes it illegal to REMOVE a serial number or to possess a gun from which the serial number HAS BEEN REMOVED, but does not make a gun illegal that never had a serial number.
As to the pistol made from a rifle, no law would be violated if done by the factory and they made it a new model. That is essentially what Remington and Savage did with their XP100 and "Striker" pistols.
Jim
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