Competition for a new carbine is heating up and the big dog just entered the fight.

Colt officially unveiled its CM901 at the 2010 Association of the U.S. Army Convention and Exposition, held Oct. 25-27 in Washington, D.C.

Countless soldiers lined up to find out what this new weapon is. The answer: Just about anything you want it to be.

The CM901 boasts a universal 7.62mm lower receiver and multiple barrel lengths a 10.3-inch for close-quarter battle, a 13-inch that is accurate at 500 meters, a 16-inch heavy barrel that is accurate to 700 meters and even 18- and 20-inch barrels if you want. A shooter can switch barrels with the push of two buttons it takes longer to explain it than do it.

I'm guessing it's something else we can't own in MA.