76 mm air defense gun M1938 () was 76.2 mm (3 inch) Soviet air defense gun, created by Soviet artillery designer M.N.Loginov. This gun was a modernized version of the 76.2 mm air defense gun model 1931, with a slightly modernized barrel and a completely new two-axle carriage ZU-8. This carriage was also used for the more powerful 85 mm 52-K air defense gun, developed in 1939. The external appearance of the 76 mm and 85 mm AD guns is very close; the two types can be differentiated by their muzzle brake, the larger gun possessing the larger muzzle brake.