I'm new to AR's. I've shot my uncles Oly's and RRA'S...and the assortment of others that he has and fell in love. Now I'm building my own; I completely built my lower the last time I was home. CMMG stripped 5.56 lower RRA standard lower parts kit DPMS 4 position buttstock I've been looking around for a package deal on a complete upper with BCG, I was wondering if anyone has had any problems with Palmetto State Armory uppers? And also open to any suggestions, I'm wanting to make a 16".