This is a very rare and certainly unique, early Hungarian prototype semi-automatic rifle patented by Rudolf Frommer and manufactured at the FEG factory in Hungary. The FEG factory was established in 1891, and throughout its history it has been renamed several times, first as Fémáru, Fegyver- és Gépgyár ("Metalware, Arms and Machine Factory") in 1935, to Lámpagyár ("Lamp Factory") in 1946, to Fegyver- és Gázkészülékgyár ("Arms and Gas Equipment Factory") in 1965. During this entire time, it supported the Hungarian military with a constant supply of military weapons and equipment. There is no available information on this rifle, so it obviously is some type of early prototype or test rifle and is probably the only one still in existence. It is a gas operated rifle design with an all machined receiver/action that has a gas block/port located about 2/3 of the way down the underside of the barrel. Attached to that a full length operating rod/gas piston is mounted that has a operating rod mounted on the right side of the action, attached to the bolt. The recoil spring is also located on the upper right side of the rifle, and it has a "squeeze grip" type safety. The only markings on the rifle are on the top, left side of the barrel which reads: "FEGYVERGYAR-BUDAPEST/FROMMER'S PATENT" and on the lower right side that read "AUT" and "REP". It uses a two piece stock design with a walnut buttstock and full length forend that is fitted with a full length steel plate on the underside. The plate extends from the front of the receiver to the front barrel band and has three large ports, where you can see the operating rod inside, which makes the rifle fairly heavy.

Very fine with 85% of the blue finish overall with edge and high spot wear and the top rear section of the barrel, recoil spring tube, and front edge of the receiver showing a large area of moderate pitting which has been cold blued. The internal parts retain their original "in the white" factory finish. The stock and forend are both in fine condition with light minor handling marks intermixed with a couple of very minor pressure dents on the sides of the forend. Mechanically functions, but operating rod does not always engate bolt properly.