Not meaning to get too personal, but I assume it's somewhat less expensive to put such a weapon together from parts, than to purchase retail from any manufacturer in any gun shop.
About how much does it cost to build one of similar quality?
When I left Viet Nam in April, 1970, they were preparing to turn all the SF Camps over to RF/PF units.
I came very close to disassembling a Car-15 and sending the barrel/forearm and stock assemblies home, so I could build a semiautomatic one on an AR-15 receiver.
Such weapons with short barrels and collapsible stocks were not available to the public at the time, I don't think.
Didn't do it. Glad I didn't.
I'd probably have gotten out of Leavenworth by now, though.
Charlie Noyes