Let's review a little history. The original Colt/Armalite M16 was designed for jungle combat where engagement distances are short. The original problem with the Colt rifles was with their chambers. The Colt people told the Army the M16s didn't get dirty, thus the rifles were shipped into combat with no cleaning kits. Bad choice. The original chambers rusted rapidly in jungle climates. This was later addressed with chrome chambers and cleaning kits issued to the troops. Early ammo was also a problem and some say the problem persists today. The M16 platform is well suited for the combat our troops encounter in the Middle East today where they usually fight door to door. I would like to see them go to a larger caliber round such as the 6.8, but the military guys in our family say they much prefer smaller lighter ammo. They like the idea of having as much ammo as they can carry, just in case.