One thought, as you so frequently bring up, is we ain't in the military...
Korea had a lot of static battle fronts ( and a lot of fluid ones too).
I don't see any rules about waiting for the bad guys (whoever they are) to cross some politically defined line in the sand.
The smart thing is to engage the enemy as far away as you are capable of doing so effectively. This helps eliminate the FUBAR factor from happening where you have no options to recover from it. (And it can still happen at any range)
If I have 5 seconds to recover from an OH SH!T at 200 yds, and 2 seconds to recover at 100yds, I'll take the 5 second advantage every single time.
If I get a 20 second advantage at 300yds - guess what I'm picking.
if 500yds gives me a minute advantage, I'm there.
The shorty CAR is not a good choice for a 400m weapon - remember folks the shorty in question here has a 10" barrel, not a 16"
Argue it any way you want, but the 10" is not a good choice for 400m engagments.
:devil: