Hooah posts, Naki and Dave.
There is no need for anyone to own an M4 (for example), unless you are a legitimate collector. Most collectors also de-mil the weapon too, simply because they have no need for say an MP-40 to be in firing condition.
I also dont see anyone invading the US anytime soon, regardless of whether or not they have 99 from 155 Battalions deployed right now.
The only country remotely capable of it is Russia, which they are not really. Or Canada, if they wanted even MORE land. But I cant see that happening right now
List me five good uses a MSSA has outside the military please.