The concept is “simple” a “Well Maintained Equipment” or something similar upgrade perk for squads that can build some kind of structure, be it anti-aircraft, anti-tank guns, etc. which gives you a number of benefits, here is the list:
-Anti-aircraft: You can rotate the turret faster, maintaining its gun reduces its overheating and in the Soviet case it gains the faster reload perk of tankers with a magazine
-Light Machine Gun: It overheats slightly and you can rotate the gun slightly better in all directions and a little further than usual because it is well oiled, in addition to being able to withstand more than one shot from a small caliber
-Heavy Machine Gun: Allows you to rotate the gun more easily and overheats less
-Ampulomet: Improves aiming arc
-AT Weapon (low and high br): Allows you to move the gun more easily and has the same upgrade as the fast reload tankers
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