Walking? Pffft. That's for the Marines.
Death before dismount.
That being said, there were times when I told myself that a full sized M-16A4 would have been great, it was shortly followed by father's voice echoing in my head saying "When your in charge, take charge." and then remonstrating myself that Danny was pretty damn good with his DMR.
NRA Life Member
Big Sister: "Everyone in America is fine with the .30-30, except Mack. He has to shoot that .35 because that extra point zero fives inches will matter on Bigfoot."