The Thompson Custom is the company#x27s latest offering. Penney believes this number was closer to 500. Their source for this information was John Arnold. United States Martial and Collectors Arms, by Military Arms Research Service, San Jose, indicates National Ordnance produced over 2000 M1 Garands between 19. These special numbers are too vast to list, however we have included them in the quantity counts. Some serial numbers were never manufactured, while many special serial numbers were made during the regular manufacturing process. The serial numbers were basically manufactured in sequential order. The precision manufactured, carbon steel slide, sear, and disconnector are heat treated properly for durability over many thousands of rounds. OVERVIEW- AUTO-ORDNANCE 1911A1 PISTOL OVERVIEW- AUTO-ORDNANCE 1911A1 PISTOL The Auto-Ordnance 1911A1 series incorporates GI specs, and features a matte black finished frame, barrel, and slide. Thompson Custom 1911 - Auto-Ordnance | Original manufacturer of the. Auto ordnance serial numbers OctoAuto ordnance serial numbers