What length barrel(MTU contour) would be perfect to run with and without a can? I'm going to order with MPA chassis. My can is 5 inches long so I don't want to overdo it. But it would pretty silly if the 18 inch does clear the spigot mount when I run it without the can. Also, any recommendations on the barrel make Ace, Bartlein, or proof. I've heard they are all good. Leaning on Medium bolt knob. How far will 30 MOA base get me out to running scope with 32 mil of travel on average? Like to be able to sight in at 50 yards and get out to 400 yards. Have no idea if this is possible. Anybody tried the xtr burris rings? Thought I might utilize them if everybody has good luck with them to get the most travel out of scope as possible. What height rings are you guys running to clear 56 MM scope 34MM tube? That's a lot of questions. Thanks in advance only want to cry once.