CMT (or more properly Continental Machine & Tool) is a military grade AR parts manufacturer providing components to many leading AR-15 platform rifle brands. It is said CMT has produced a great many of the parts used in the US Military weapons in the past 20 years. As a CMT subsidiary (founded by the owners Son) Stag Arms is the most well known user of CMT parts. Colt firearms, Bushmaster, RRA and S&W are also rumored to be customers as well.
Company Website - Note: contact information only, NO firearms pages!
Basic description of what CMT does, and for whom - short question/answer thread from the Highroad website
Stag Model 6L Heavy Varmint model - by Guns & Ammo
Thread on lower receivers available - including CMT which is one of the few REAL lower manufacturers
Cold War Shooters