The Chinese invented gunpowder, but they were not the first to develop firearms.
Sam Colt invented the revolving pistol, therefore, all revolvers are
correctly called pistols.
Revolvers cannot be silenced, due to all the noisy gasses which
escape the cylinder gap at the rear of the barrel.
A 12 gauge rifled slug does not spin, even though there are grooves
on its bearing surface. A slug actually travels like a dart.
A bullet fired from the 7.62 x 51mm NATO cartridge (also called the
.308 Winchester) is still supersonic at 1000 yards.