The IAR 81C was a Romanian World War II fighter and ground-attack aircraft. From Wikipedia: The final stage in the IAR 80's wartime history was the 81C. This version changed the guns once again, this time to the Mauser MG 151/20 which was replacing the MG FF/M in German service and had just been released for Romanian use. The order for the 81C was placed in May 1942, predating the second order of the 81As.
The first order for 100 airframes was delivered, like all of the prior updates to the 81 series, with the centerline bomb rack removed to be used as fighters. An additional order for 35 was placed in February 1943, and then another 15 in January 1944. These aircraft were primarily to replace losses in earlier models, while production of the Bf 109G ramped up.