Been interested in polymer lowers for a long time but no one ever seemed to make a decent one and some closed-up shop. It seems you have figured it out how to make them right. And you offer a .308 too! Want to build a light .308 one day. I am a 6.8 fan and will be building my next rifle with one of your lowers just as soon as I finish my current build. If you build a 6.8 rifle please contact Harrison at AR Performance for the barrels. He has perfected the 6.8 offering that Remington messed up. I am getting 3000 fps out of a 16" barrel pushing the 85 grain Barnes TSX bullet and reloaders report 3100 fps. It is awesome on coyotes, hogs and whitetails, etc...
Only issue I see with your lowers so far, is cosmetic, these might be old videos, and you may have addressed this problem already. The over-flashing, rough edges and some tooling marks(circle on front/side of receiver near pivot pin) left on the receiver. Be nice if they were cleaner looking...other than that I am sold. Colors that come to mind...Coyote Brown or some kind of darker brown(daniel defense brown is nice). Gray-Blue or Blue-Gray, Navy Blue. Thanks for perfecting this lower and continued success!