I have the DMPS LR-.204 . With scope, bipod, and fully loaded clip it weighs in at around 14-15 lbs, which doesn't bother me like it does most. Heavy but steady. Shoots good. It will match up to your RRA. The rifle itself is 10.25 lbs empty so I would have to guess that the upper alone is 7-7.5 lbs. I'm pretty impressed with the caliber, it is a laser. The only thing I have killed with it was a badger. If your looking for a .204 and the weight of this particular upper doesn't bother you, I think you'll be very happy. I am! Hope this helps.