Say What? Hard to come by?
Maybe wherever you live, Prince of Space. But around here, in the sticks, they are widely available, across the whole spectrum of Semi-automatic firearms...handguns and long guns.
an assault weapon has a specific definition of being select-fire, uses a cartridge intermediate in power, and has a detachable magazine. and an effective range of 300 or so yards.
The US considers a selct-fire weapon as a machine gun....which can be got with great difficulty.
Flippin RATs\gun-grabbers\MSM think anything that looks like an M-16 is an assult weapon.
The poster you are responding to is talking full auto or select fire, not semi auto. Major difference, extremely expensive and very hard to legally obtain.