Took my first build to AGC late morning - seems to work very well! Just a small tweak to the gas block, and learning how to properly feed the mags, but slapped a cheap $40 red dot on, took it out to 100yds. Now for the scope...(posting that inquiry on the scopes forum). Thanks, all for the advice on the build - this was a long dreamed of project, and think I'll enjoy it!