Anything that you like from BCM or FN.
But we also have 3 14.7" uppers with FN barrels from PSA that have been 100% solid & bullet proof.
None of the above can be called precision guns as they all have Chrome lined barrels, but they are all more than adequate, all going a consistent 1 1/4 - 1 1/2" with good ammo.
MM
I always appreciate your advice, and the advice of others here like TWR, and even Blue. Blue has probably seen so many different types of cheap AR's and the failures associated with them. I still consider myself new to the platform, but it would be nice if some of you guys with more knowledge and experience would lay down the important stuff that will keep an ar functioning 100%. I will list some of the things off the top of my head:
1. Buy a GOOD BCG!!! That could mean RCA, Noveske, BCM, even some Tool Craft premium BCG's are good stuff.
2. Buy a good, well known barrel. FN, Ballistic Advantage (Aero Precision), WOA if you have the extra coin.
3. Make sure stuff is properly staked.
4. Proper gas tube.
5. Gas block. That does not mean it has to be a high dollar AGB either. I prefer non adjustable gas blocks that are fastened properly. Guys running cans should probably use the AGB.
6. Run the proper buffer springs and buffer for the loads you run. That doesn't mean a high dollar JP silent captured spring system either. A cheaper Armaspec stealth recoil spring system works just fine if you want to try, but not spend so much $
7. Trigger: Single stage, 2 stage, that's up to you. They all work, but offer different feels. I prefer a real smooth trigger pull at around 3.5 pounds. That is either single or 2 stage, doesn't matter there. The RRA 2 stage varmint match is a damn good trigger for the money (less than $80 most times).
8. Upper and lower receivers. Most are about the same and you are paying for a name. Some are worth a little more money, as the tolerances are tighter and the finishes are better. Just don't get a poly lower!!
9. Upgrades like an Ambi charge handle are top of my list. The Radian Raptors are very nice.
10. The sky is really the limit on other upgrades you may want to get. Stock, grip, handguards, bad lever, LPK of your choice.
The moral of the story, if you put one together, put good/great parts in it. Make sure things are lined up perfectly (like your gas block) and properly held in place so it will not come apart. Barrel properly torqued down and even bedded in some cases. I've never had a single issue with any of my AR's and I used to shoot them a lot. My favorite is a Northtech Defense, but most guys here have never heard of that one. I have well over 10,000 rounds on that one without a single failure. The first AR I bought was a cheap Rogue Defense that was built in Oregon. It runs flawlessly as well, but uses a RCA bcg. I've changed barrels on that rifle 4 times now, gave it to my dad and then got it back after he passed away. That rifle has also ran flawlessly. However, I don't know if I'd suggest buying from a small town no name AR builder in Oregon. It's a damn good rifle though. The finish is tough as a diamond and the damn thing runs and has ran thousands of rounds down range. Shot my smallest group at 400 yards with it last year, after I got a Bushmaster HBAR on it.
It really boils down to what parts you put in it, and how it's assembled. [bleep] parts and no attention to detail will leave you stranded. Don't be one of those guys..