Eagle Gun Co, Inc., Stratford, CT, made two rifles that fired from an open bolt. These are pictures of an example of the first type. It is in .45 ACP caliber. They also made a "Mark II" model, which is so marked, and also says it is in both .45 or 9mm.
These were made from about 1964 to 1967 or 1968. The Spitfire and the first model of the Volunteer Enterprises rifles are almost identical to this gun. It seems probable that the design, some parts and tooling were passed from one entity to the next. Unlike the Spitfire, this rifle was never classified as a machine gun by ATF, and assuming it has not been modified, is legally speaking a semi-auto.
Here is the inventor's obituary:
"Date: July 15, 2007
Publication: Connecticut Post (Bridgeport, CT)
ORDNER William M. Ordner Jr., age 71, husband of the late Bernadine Forgett Ordner of Stratford, died Wednesday, July 11, 2007 at Yale-New Haven Hospital. Born in Bridgeport, he was the son of the late William and Alice Ordner. He was a design engineer and retired owner of the Eagle Gun Co. of Stratford. He was a member of the First District Club, the Germania Schwaben Society, Elks Club, National Rifle Association and worked for Stratford Development as a field engineer."
Mr. Ordner's wife's brother was Val Forgett, Jr. a noted firearms dealer and importer, who ran Navy Arms in NJ, and earlier (in the pre-1968 days) a deactivated machine gun business called Service Armament Co. Today Val Forgett III runs the family firearms business.
A time after the Eagle Gun Co business was defunct, Mr. Ordner was entrapped by ATF into assisting them, in an elaborate "Godfather" style sting, in making unregistered pen guns. In spite of the fact that ATF targeted him with no suspicion of law breaking, terrorized his family (by staging an attempted kidnapping of his minor daughter) to maintain his involvement, the courts sustained his conviction, deciding a jury could decide he had participated freely, in spite of the despicable ATF conduct in the case. See UNITED STATES v ORDNER, 554 F.2d 24, 2nd Cir 1977. I have to think that his being targeted for the sting was due to his invention and involvement in the manufacture of a open bolt "assault" style firearm.