Model created in 3D Studio Max 2009 and converted in multiple formats. All formats include materials and texture maps. The Max format uses mental ray materials and render. There's no need for a third party plugin or anything else, just drop your model in the scene and hit render. The M3 was an American .45-caliber submachine gun that entered U.S. Army service on Dec. 12, 1942, as the United States Submachine Gun, Cal. .45, M3 and began to replace the .45-caliber Thompson series submachine guns: the M1928A1, M1 and M1A1 that were slowly being withdrawn from use.