If you're thinking about the MP 43/Stg 44, then they are selective-fire and a Class III item. The MP 43 was renamed the "Sturmgewehr 44" after Hitler found that it had been put into production against his orders, but that the troops on the Eastern Front still couldn't get enough of them. These rifles have sort of a weird safety/selector system on them; the safety is a thumb-lever sort of like a modern H&K design, but the selector is a cross-bolt above the pistol-grip that's marked "E" ("ein", or "one") on one side, and "D" ("dauer", or "rapid") on the other.