I am currently building my second ar. My first one was a rock river lower with a doublestar 20" fluted stainless barrelled upper. Now I want a carbine so I got a rock river stripped lower for $99 bucks, $60 for a del-ton lower parts kit. $80 for a yankee hill stripped upper,$15 for some dpms upper parts. $169 for a daniel defense 1-7" twist chrome lined barrel,$120 for magpul MOE OD green furniture set. I just ordered the Adam arms piston kit for $279 so now all I need is a bolt assembly, Is there anywhere online to get a good cheap bolt or should I wait till the 16th for the indy gun show and pick one up there. Also can anybody recommend a good halo sight, I want an eotech but I cant justify $400 bucks, I would like to find a decent one for under a hundred bucks.