Who makes the best AR15s?

There’s quite a lot. BCM, Spikes Tactical, Daniel defense, Noveske, LMT, among others. Or you could just get the parts and build your own.

Its preference.

S&W is good, Ruger, Delta.

I have a Delta and fired it a lot already. 

I payed around 900 dollars. 

Since the proprietary patents ran out, there must be 100 manufacturers. I'm partial to DPMS.

BCM, Daniel defense, Noveske, LMT, Knights Armament are the best ones,  Spikes Tactical is good.  There are only a couple of brands that you should avoid.  You probably don't want a plastic lower either (they call them polymer or some fancy name for plastic).

My latest is a Palmetto State Armory build...

I have a Spikes Tactical I like very much. It is my favorite and I have several

AR's.

For what it's worth, I bought the Bushmaster Patrolman M4A3 (police model) a few years ago.  Will take any of the "furniture" you can find.  I have it scoped, a red dot, laser/scope, and it's own iron sights.  Depending on my mood.  Reasonably priced and have had zero problems.

There's a significant sum. BCM, Spikes Tactical, Daniel monitor, Noveske, LMT, among others. Or of course you could essentially get the parts and collect your own.

about more to visit under source box.....

There's a considerable amount. BCM, Spikes Tactical, Daniel guard, Noveske, LMT, among others. Or then again you could simply get the parts and assemble your own.

Armalite.              

I built mine with a kit from Palmetto. Was right at $400, and has been solid. Will toss .223 or 5.56.