What is the highest end ar15 brand (that can also have a bayonet lug)?

[Glacierwolf]

That is like asking what is the most expensive car that can have chrome wheels. The bayonet lug is something that comes with the gas block, front sight tower, or just bolt on. You can easily add it to most any AR upper when ever you want.

So far the nicest AR made I know of - is done by Seekins. The have a totally re-designed lower with matching upper - just the stripped upper and lower will cost you $2200 last I checked. Compare to $130 for a standard lower and $89 to $120 for a standard flattop upper. Just google Seekins custom AR and you will find links to their web site.

If $2200 is too little to spend - you can order it as a SBR (short barrel rifle) that will easily add $100 more to handling and $200 more for the tax stamp.