So if I am doing this right...my rail is 1/4" or 6.35mm. Bell objective is 56mm.The standard height 25 moa rail or the extra height moa rail? See what I mean? The stand height BSCAR rail sets 1/4” off the top of your barrel and the extra height rail adds 5/64” to that for a total of 21/64” off.
As an educational assist, I’m going to refer you to this sticky thread in the Optics forum:
Rifle Scopes - Ring Height Info - How to Measure Correctly
Guys, Lately, on average of about 1 per day, I have seen quite a few posts (mostly from newbies) regarding questions about what ring height should be used. They usually request pics for comparison. For all new guys, there is a systematic way of calculating ring height that doesn't require more...www.snipershide.com
Teach a man to fish...
(6.35mm+28mm ring height (ARC M10 medium rings)) - 28mm = 6.35 mm or 1/4".
Looks like medium height rings will allow 1/4" clearance