This is the Armalite Eagle Arms AR-10T. Basically a stock AR-10T but outfitted with a tactical style pistol grip, Chip McCormick single stage trigger, David Tubb CSS recoil spring and David Tubb Carrier Weight System. Most of the accessories were purchased to alleviate "fail to feed" problems that plagued this rifle since I bought it. However, in learning and understanding the AR system a bit more I was able to troubleshoot the problem to a poor fit between the receiver and the barrel extension which caught the tip of the bullets and caused the "hanging" problem. Since fixing the receiver/barrel extension problem, the FTF problem as pretty much gone away.