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It's going on a 16in AR, built up my rifle to be sort of like a recce rifle. I also just prefer the look of 2 piece and haven't run into issues with spacing on the flat top or anything like that. I've been looking into the Larue SPR but it looks a little bulky, I was also wondering how it compares in weight to a simple 2 piece. I'm running weaver skelatonized at the moment, and the Mark AR is the 3-9 mildot
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Thanks for detail. How are you getting proper eye relief on your stock and cheek mount with that scope and a front ring still on the front slot of your upper? Every Leupold scope I've looked at, including both an LPS and the VX-R Patrol I currently run have an eye relief of about 3.5" to 4". When mounted on an AR this usually puts the back of the eyepiece just about directly over the rear of the charge handle. That puts the turret too far forward to get a standard Picstinny or Weaver ring in front of the turret and still attach to the receiver upper rail.
Here is my VX-R Patrol in a LaRue SPR QD. Note where the turret is in relation to the upper rail slots. I cannot get a ring on the scope in front of the turret and attach it to a receiver slot. If I move the scope back, my eye relied and cheek weld are blown. Ime pretty sure the Mark AR turrets are about the same distance forward from the back of the eyepiece. This is why I asked for photos of your setup, and why most of us are running cantilever one piece mounts.
Two piece tactical mounts work on the 7.62 AR 10, because the upper receiver is longer and has more slots. Not so on the AR 15. Very short upper.