i'd be hard pressed to believe anything RRA could match up to a custom. also for the person using the cmt receiver, i'd sell it, forget it and upgrade to a mur or stealth.

if you want to use a mur, then buy a lilja 20 "super sam" or 18 heavy varmint contour. larue mid-length forend and mark's gas block. then i'd go with a jp tactical carrier. fill in the blanks from there.