An experimental wooden foregrip is attached to the barrel. The Sionics, Atlanta GA marked weapon was only capable of full-automatic fire. Ingram/Sionics M10 serial number 3 was a pre-production prototype produced after Ingram teamed up with Mitch WerBell. There were no orders or production of Ingram’s Model 10 submachine gun by the Erquiaga Arms Company. Treasury Department during one of the frequent raids on the Erquiaga factory. On 17 February 1965, Ingram’s first prototype Model 10 submachine gun was confiscated by the U.S. The first M10 submachine gun was a 9mm full-automatic only weapon and used a Sten magazine. Ingram and Erquiaga negotiated an agreement, and the rights to manufacture the Ingram Model 10 were granted to Erquiaga Arms and included in their catalog of weapons in October 1964. The completed weapon was then presented to company owner Juan Erquiaga. The new compact Model 10 was completely different than Ingram’s previous designs. By August, the initial drawings were completed and in September 1964 the first hand-built Ingram M10 submachine was finished.

While employed at Erquiaga Arms Ingram began work on another submachine gun, chronologically designated as the Ingram Model 10 but was conceived on his own time and expense in his garage workshop. After returning to the United States Ingram took a job with Erquiaga Arms in California to assist in development of Juan Erquiaga’s MR-64 submachine gun.

His efforts proved unsuccessful and very few of the Model 7 through Model 9 guns were built. After the demise of the Police Ordnance Company, Ingram continued improving his Model 6 design with Models 7 through 9 and attempted to interest foreign governments in the weapons. During the 1950s Gordon Ingram organized the Police Ordnance Company and had some success with Ingram’s Model 6 submachine gun.

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