AR-15s
In over 35 years of shooting, messing with, building and modifications to ARs and M16s the gun has gone Gucci. None of mine have anything but a military looking upper and lower. I could do without all the forward assists as they were a mistake in the first place.
I have Colt uppers, PSA uppers and DPMS uppers. No issues with any. Just make sure that if the upper has M4 ramps the barrel extension on the barrel you choose is an M4 extension.
So much confusion and misinformation about the system, “mil-spec”, the TDP, overgassing etc. Buy a quality pressure tested and MPed bolt, good carrier with chrome lined “cylinder”. The barrel you like for your purpose and accuracy expectations, and life. Round count is not what destroys barrels. Its heat. Shot out barrels in 8-10k and have others at 30k still good headspace and 1 moa.
A bit about PSA. They have like three tiers of parts. The premium line are FN made. There uppers and lowers were. Not sure now. The FN hammer forged chrome lined barrels are great. And better than the Colts for accuracy on the Commandos we had at work.
could go on and on and on….what is the rifle’s purpose to be?