I was looking on another forum...and found a thread about super light weight ARs. Now I'm on the hunt for light weight build options... I'm aware of the Balios light receivers made by 2A armament - they look sweet, AND expensive. I just became aware of San Tan tactical - Has anyone seen these receivers and uppers in person? Care to comment on weight and costs? I already have a nice DD light weight 16" barrel, 13" BCM KMR (my god it's light), and I'll be looking at light weight carriers...when I can stomach the prices for titanium parts!! Anyway - what have you got??