Nice builds. The AR10 quickly became my favorite after scoring a pawn shop hodgepodge that no one could match mags to. Now I have about 4 in the works. The same with the pistol platform. It's habit forming. Good deal on parts leads to more builds. Got one in 300 BKO and one in progress in 45 ACP.
Love what you've done with yours, Miller. Have you considered other calibers for your next build(s). You know there's gonna be more. Any .308 based cartridge is fair game.