Nice AR, mag318! Hard to go wrong with Colt and you've got it about as milspec as anyone can get it with the Matech and ACOG! Thanks for the range report...
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek