Go with a Tier 1 manufacturer. If you try to cut corners and buy from some outfit that's new to the game, there's a good chance you'll have heartache. I had Bushmasters and sold 'em. Since then, I've only bought Colts and I've traded into a LWRC piston gun. Go for a Colt 6920 and never look back. They can be found NIB at good prices on Gunbroker. Buy right, cry once.