5.56

The Colt Piston AR LE6940P.

LE6940P: A Cleaner Burning Colt

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.

The Colt LE901-16A configured with 7.62 upper. Photo by Corey Graff

Colt LE901-16S: From 5.56 to 7.62 in 30 Seconds

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.