I have been an AR owner since 1998 time frame.
I owned in order:
- Colt Match HBAR
- Armalite M15A2 (with the muzzle brake)
- Bushmaster (A2 Stock, Carbine upper)
- Bushmaster Patrolman's Carbine 2 of them (I had to go through 3 different rifles to get 2 of these that worked
- Colt 6920 (4 of them)
- Colt 6724
The Colts are the ONLY ones that I never have had a malfunction with or had to send back to the factory (Bushmasters) for some type of issue. I was almost ready to swear off AR-15 type weapons forever until I got my 1st pair of Colt 6920s.
That being said, if you are looking for a rifle that is more than just a basic combat rifle, you need to look for a different brand/options. BCM and DD have some nice rifles that meet the minimum requirements for a combat rifle but have functionality and accuracy enhancements.
If you are wanting a purely target rifle, a DPMS/Bushmaster/RRA/etc. will work great and won't set you back as much cash for the same or better accuracy performance, but may or may not be as durable under severe firing schedules.