I have a BDC Mark 6 1-6 on my JP 308. The JP weighs 6.25 pounds, it has the heat sinked rap thing. The Mark 6 is 17 ounces. I love it. The only bad PR I've ever seen on the Mark 6 is the dials. I don't use them. I can bang steel at 200 yards standing off hand. 10 out of 10 times side to side...