I'd stick with a rifle length gas system- so a 20" will do. I'd go with a Krieger or other quality barrel in Wilde.
77 SMKs are a staple, but Bergers, Hornady and others work well too.
This. No need to go longer as you aren't gaining anything from it. 1/7.78 Kreiger with a Wylde is how I'd go(and did). If you are going to spend upwards of $500 just get the prechambered Kreiger and be done with it. You won't find a more accurate barrel out there for an AR.
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