I have an AMG mounted on a Stiller action w/ a 20 MOA rail. Heavy Varmint profile barrel. I'm using Seekins Medium (.87") rings. I have clearance for the Vortex scope covers, no issue. There's not a lot of space between the objective cover and the barrel, but it's definitely not in contact. I'd suspect I'd have room with an MTU contour, but don't know for sure.