This seems like a bug, given the trooper, the signature weapon of the MS16 is weaker than the normal version.
Also I was very dissapointed because the Icon shows the trooper having a reflex scope and it turns out to have an ACOG scope. Just wanted to let you know that.
PS:
Just found out anything I do in coop with a friend doesn't save in my game...except the hides hunting so that is total bs :P
-J