Troy is a well established AR manufacturer that has decided to get into the market of "retro" AR carbines, making replicas of US military rifles from specific interesting periods and combat operations. Ian purchased one of their GAU-5 clones, and have had a great time shooting it, with no problems.
These rifles are a great match for the historical military enthusiast who wants to shoot these time capsule like rifles.
The quality is good, the historical accuracy of the builds is good, and the price is good. Colt is pricing their M16A1 retro rifle at $2500 and have not yet been able to introduce their carbines; while Troys prices are around half that much.