This is kinda a zombie thread, but since I didn't resurrect it...
I am working on a 358 winchester AR-10 build. I am trying to build the elusive 7 lb or less AR10 with this gun, so every decision is heavily involved by weight.
I have a 16" KAK barrel in 358 (2 lbs 7 oz, dang), and a TN Arms DPMS pattern 308 lower (6.8 oz, YAY!). I have been looking at Fulton Armory slick side uppers, and have been kicking around the idea of a side charge. Beyond that just starting the shopping.