The L-11 was a low velocity Soviet 76.2mm (3 inch) tank gun, used on the earliest model of the T-34 medium tank. L-11 was used on T-34 Model 1940 and KV-1 Model 1939.
The L-11 gun was 30.5 calibers long.
L-11 was originally meant to be an infantry support cannon. It proved ineffective at late 1942.
References
L-11 76.2 mm tank gun Wikipedia(Text) CC BY-SA