This is a very nice example of a late WWII US Army contract M3A1 SMG manufactured by the Guide Lamp Division of GM. These were developed in the 1941-1942 time frame as a wartime substitute for the Model 1928 Thompson SMG which although was a superb SMG proved to be costly to produce. This is a late production model that was manufactured originally as a "M3A1" SMG. The left side of the magazine well is marked "SUB-MACH. GUN/ CAL. 45 M3A1/Guide/Crossed Cannons (Ordnance proof)/U.S. NO 623442". As noted this late production model has the combination ejection port cover/safety on the right side. It has a fixed front and rear sight and is fitted with a retractable wire stock complete with an original oiler stored inside the rear pistol grip. There is a very small import mark of "INTER AMERICAN SAC.CA." on the left side behind the front sling loop. It does not come with any magazine.

Very fine with 90% of a reparkerized arsenal type finish overall showing only minor edge or high spot wear. NOTE: This weapon is a restricted, National Firearms Act (NFA) Class 3, Fully Automatic Weapon, that is registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE) under the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 478. This weapon is currently registered as being "LIMITED TO USE AS A SALES SAMPLE (Pre-86)" and as such can only be purchased by an FFL, with a Class 2 or Class 3 SOT License.