What is a “black gun”? Just black colored or does it mean something else?
ARs are usually finished* in black, while "sporter" rifles and shotguns have usually been furnished* in wood. There is now a considerable portion of "sporter" rifles and shotguns being done in black, and ARs in color, but the nickname usually refers to the AR platform in all its variety.
Another FRiend calls them "EBRs" (evil black rifles) and his local merchant as the "EBR store". He also builds and accessorizes them for fun.
*not a typo.
“Black gun” is another euphemism for what a lib would call an “assault rifle.”