Except it’s complete fiction at this point. Like the weapon never existed for infantry and never could. You might as well give soldiers a shoulder fired Flak-88 at that point.
And like I said, there was a very real variant of the MG-81 converted for infantry use. Just use that instead of a fictional version of the aircraft gun.
There are now Fantasy weapons in the research tree the AS-44, RD-44 and T-20,There is no problem adding a Light Machine Gun that can be carried without any problem by the Infantry even if that version is only for airplanes.
I know there was a post-war conversion of the infantry variant that fired 7.62 Nato at around 1200 rpm and had a 100 or 150 round belts. Idk if the WW2 infantry version mirrored this or not, but I do know one existed during the war. Personally, that’s good enough for me. Make it an event weapon to balance out against the stinger
Except no infantry variant of the MG-81Z ever existed, nor would it even be possible or practical to make one. That is purely a fictional fabrication. There were other Infantry variants of the MG-81, just use those. There’s no point in making up a fictional weapon when a perfectly good real weapon exists.