Fair enough, my RRA SPR is a dedicated shoot off the bed of the truck at ground squirrels set up. I don't care how heavy it is, I'm not walking around with it. I've got other ARs for that.
Anyway I get the picture of what you want and I would look into a Noveske Rouge Hunter upper.
http://www.midwayusa.com/product/442...rd-flash-hider