It's no secret that guns have a limited lifespan. Shot out barrels have to be occasionally replaced. Aside from entire tanks, the Soviets received replacement barrels to perform repairs of foreign weapons. The table shows the number of barrels received in the denominator, the number used up in the numerator, the total in the second last column, and the surplus in the last column.
CAMD RF 38-11369-1
The items are as follows:
76 mm howitzer
76 mm gun
75 mm gun
57 mm gun
40 mm gun
37 mm gun
12.7 mm MG
7.62 mm MG
7.92 mm MG
7.7 mm MG
11.43 mm SMG