IIRC, I ran a 42 on a K1A Swede - sporter profile w/ medium rings - and used a shim cut from an Aluminum can, on the lower half of the rings. That or a business card will do if you need that little extra.

Also ran a 1B with a 270 with a 36, with PLENTY clearance.

Last edited by 65BR; 11/02/20.