Hello guys, I need some opinions/input/options.  I'm looking for some new fire control parts for my AR because my current set of parts sometimes doubles and once, tripled.  It does this sporadically, and I can't figure out why.  But, regardless, rather than try to fix (or as some would interpret, "tamper") with the fire control parts, I would just rather replace them.  What options do I have as far as replacement trigger parts go?  Regular Mil-Spec, or aftermarket?  Single or Two-stage?  I've handled an AR with a RRA two stage, and I like it, but I just want some other opinions.  I'll be putting it on a 16" general purpose AR.  TIA

Ghost