Ammo is not ammo. And when doing a .223 vs 5.56 comparison, while the loads are almost identical, they are not the same.
The Colt LE6940P is a modular carbine featuring an articulating link piston (ALP) operating system. It offers shooters a highly accurate, lightweight and easy-to-clean AR-platform rifle with an extended lifespan.
There was no shortage of AR-style rifles at SHOT Show 2012. But one of the most interesting was the Colt LE901-16S, a select-fire rifle designed to allow you to change the upper from 5.56 to 7.62 in a matter of seconds.