The CR223 and CR308 is a indirect gas operated (piston driven) semi-automatic rifle available in 223 Rem or 308 Win. The rifle features an easily removable foreend, A2 muzzlebrake, and a collapsible buttstock. Haenel follows the tradition it set during WWII, as the developer of the world's first assault rifle, the StG44. The know-how of this rifle design, went into the development of the CR223 and CR308. The MK556 is a full-auto rifle for Government use only.