As pistols they do not have to abide by 922r. So they are assembled in Romania and imported whole. They receive a Tapco G2 trigger here.
As far as practicality goes, I suppose they're about as 'practical' as any other tactical rifle. They're plenty accurate to shoot without a butt stock to 50m, so you could hunt small deer with one in the thick brush you'd normally carry a shotgun in, and they'd be handy for that. Being a small package you can squirrel one away in a vehicle or in a motel bag easily enough. You absolutely must have hearing protection to fire one outdoors, and indoors every trigger pull would noticably damage your hearing in a self defense scenario.