Private sales in my state do not require paperwork, so technically speaking, a stolen gun could get passed along to an innocent buyer quite easily. I also don't wear a tinfoil hat. LOL

I meant as another reason that people blur it... they fear the # will be used in a straw purchase or otherwise shady transaction.

 

we don't need paperwork here, either.

I do believe the NSA has got a snoop program to catch the s/n's from satellites.

or drones?

Those heat treated receivers are lead pot annealed