I just bought a use Colt 6721. Which is the AR-15A3 Tactical. It's about 5 years old with about 400 rounds through it. I got the rifle, 5 30 mags., 1 20 mag, 5-1 scope, sling, and case, plus a custom compensator for $900.00. Just wondering if you fine folks thought I got a good deal or not.