Ruger XGI semi-automatic carbine
The gun it's a very rare, experimental RUGER XGI semi-automatic carbine. Advertised in Ruger's 1984 catalogue, the Ruger XGI was originally started as a 7'62x51mm-NATO rifle that was in direct competition with the Springfield armories M1A1 or M14, and there was a patent violation by Ruger that caused the weapon not to be mass produced and made available to the public. On a side note, the XGI in .243-Winchester had been advertised to be available in 1985. The project re-spawned years after, when SturmRuger was commision to create the MINI-30 under request of the U.S. Naval Special Warfare Command as a weapon that Navy SEALs could take into Warsaw Pact countries and have the ability to use the enemies own ammo and magazines once the operator was out of his own ammo. The Military Version of the Ruger Mini-30 has the ability to use AK47 magazines.
Photo and information from: Pierangelo Tendas