[Pa-Plinker]

... How can I register this pistol without a receipt or any other documentation?

There is no "official" registration in PA. You don't have to do anything.

 

[Pa-Plinker]

Thanks for the answers. I talked to a gunsmith (new to the profession) and was told not to carry or use the pistol. He wasn't sure about registering it. I would like to carry it and target shoot at my club. Thats why I wanted to register the Smith. Any more help will be greatly appreciated!!

If you want to carry it, go to your county sheriff and apply for a License to Carry Firearms (LtCF).

 

[Pa-Plinker]

...
The NCIC only records a persons name, no gun numbers. By law the PSP can ONLY maintain records matching serial number to a successful NCIC check number (verifies this gun is in the hands of "some" qualified individual), it is illegal for PSP to record a serial number to a persons name. The only person that matches a serial number to a name is the FFL in their personal records, they report only the serial number and NCIC check to PSP on a prescribed interval. Of course in an investigation the PSP will take the serial number and then go to the tranferring FFL to get only the info for that serial number. If the FFL lost the data it is gone forever.
...

I believe you are confusing NCIC with NICS, two separate and distinct automated systems. The National Crime Information Center (NCIC) database does include serial numbers of firearms and other property as submitted by law enforcement agencies, along with information on individuals.

The National Instant Criminal Background Check System (NICS) is a national system that checks records on persons who may be disqualified from receiving firearms.