Only above 500 million firearms in the USA. About 1/3 are rifles.
He probably got it on the black market, because the serial number was removed.
It seems to be one of millions of SKS rifles imported surplus from China, Russia, and a couple of other places.
They are good, serviceable rifles, but not the first choice for sniping.
My brother has one in the same setup. The scope mounting is not optimum because the rifle was not designed with optics in mind.
I am told it is about a 3 minute of angle rifle, which is to say, about a 3 inch group at 100 yards.
My brother has plenty of rifles which will hold 1/2 inch at a hundred yards.
In WWII, the Garand had to hold 4 inch groups at a hundred yards to meet specifications. Of course, many would do much better.
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Where to get a black market gun out of state? I would not know where to start.