I want to work up some loads for my AR and therefore want to to pop a scope on it.
I have a SWAN sleeve(mid length) with the pop up BUIS and the rear bell doesn't clear the sight with medium rings.
I didn't want medium, I asked for high but the local shop said with the sleeve that medium would be fine.
The height seems tolerable but the clearance is not.
So now I wonder if I should swap them for high or extra high?
Any folks out there have the same set up?
Thanks

My humble rifle

http://thirdinfantry.sytes.net/sigs/arscope.jpg

I was unclear in my inital post.
I was trying with Leupold mediums, the high mounts seem to do the trick
I'm mounting the scope to test handloads, usually it has a ReflexII.