Half Track is a bit buggy when it come to killed crewmen. But why should the GUN skill go away? The MG gunner is still there, right? Am I even following this post correctly? I had it that the AT-Gunner got shot out but regardless of how many new crewmen I put back into the HT the gun (or any other upgrade) would not fire anymore. Same with the MG man.
While the MG gunner is still there, it basically makes it so he’s a fresh private though and while not a big deal, the bug is that the XP goes away. And for me everything works fine. though since it’s at 0 xp again id expect the AT gun to fire slowly. Unsure