my boss was showing some interest in the AR platform but wants to go with a larger round than the 5.56. I tried to push him in the 6.8 direction (because the build would be easier and cheaper) but he is more interested in the AR-10. A quick look at Rainier Arms and Bravo Company would lead me to believe that there aren't many options for parts to do your own build, and what is available is going to be very pricey. Is one better off just buying an AR 10 instead of building? and correct me if I am wrong, but for a 6.8 build, the only differences from standard 5.56 are the barrel, bolt, and magazine, right? I might be able to convince him if the price is going to be night and day between the two platforms.