1.46lbs on the UBR. 1.68lbs if you used the .308 PRS, but that's not counting the receiver extension (which the UBR comes with). So, the UBR has some beef to it, but it's still slightly under the weight of the PRS. With a 20" .308 barrel on there, even fluted, it's still going to need something out back to give it some balance. A PRS would do it well, the UBR would almost be the same, and anything else is going to leave it front-heavy. It's a .308 with a 20" barrel, so it's not going to end up as a carry-all-day, light gun. <dontknow>