[donozark]

Do you feel the M4 is in fact a 400 meter weapon? Accurate to that range, but I've read many reports it just isn't doing "the job." Never fired M4 so at a loss. But I understand USMC never went to the short barrel for reasons stated.

I own a Colt MT 6700. HB. Very accurate. Although I don't have access to range over 200 meters. Semi-auto of course. But would have no problem "bugging out" with it.

Never have liked those short barrels. Phone booth guns. Perhaps for urban SWAT or certain elite force utilization. But not on battlefield and certainly not from what I know of 'Stan by pics and talks with friends that were there.

[Durus]

It's not the best option for a 400meter weapon. Getting hits at that range is very possible with a 5.56 from an M4, but while the 5.56 is an accurate round, it's effectiveness depends heavily on fragmentation which doesn't happen reliably when it under a certain velocity. 400meters from a short barrel is under that velocity. Still the person you hit at 400meters with a 5.56 from a short barrel is going to have a really bad day.

6.5 Grendel from an 18" barrel is still supersonic at 1000meters. That will get the job done.