Thinking about doing a block II upper since I have a some parts laying around. Won’t be 100% correct since I have a normal m4 14.5 colt barrel. I’ll be putting a warcomp on it for the pin and weld job. I know some ODA’s have them and 2/75 had some. Kind of been leaning towards doing the FSP one, it’s a hair lighter. Probably would run a Eotech in it. Kind of like the slick rails but I don’t know. Oh mighty internet commandos tell me what I should blow my money on.