I am with superman though too. There are much higher quality 50 cal's out there for the same price.
Look into the Desert Tech (as superman said), Accuracy International (if you don't mind a longer rifle), and McMillian Tac 50 if you like conventional rifles. any one of these will by far out preform the Barrett in the accuracy department. I have shot a barrett 50 cal before and was very unimpressed with the accuracy...even shooting $7/round 750gr hornady match. About all it would do is 2 1/2 moa at 300 yards. That translates into about a two foot circle at 1,000, and over 3 feet at 1,500 yards if every other condition is perfect. That is not even "minute of man" so to say...maybe "minute of tank".