The "Sendero" is about 8.5 lbs. The ATACR is about 2.5 lbs, add rings, bases, sling, your going to come in 12 lbs or close.
Some of the new models next year will cut about 8 ounces. When I looked at the 4-16 thats what I remember anyway.
I will say getting behind my ATACR for the first time, was really a "Where have you been all my life moment".