Rifle Scopes Big objective on flat top receiver

Is this a large frame AR or small frame? If large frame you may not need a cantilever mount depending on if you have an adjustable LOP stock and have a scope with decent eye relief, here is a shot of my AR-10 with a Bushnell inside an ARC M10 QD-L 1.38" high mount, if I had a full rail the 50mm objective would just barely clear, so with a 56mm objective bell I would say you'd want a mount that was at least 1.5" high, ARC makes a mount that is 1.57" high which should work with your 56mm scope and flat top - https://www.americanrifle.com/shop/product/m10-qd-l-scope-mount-9?category=15
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If you feel you do need a cantilever I'd recommend the Aadmount, ERA-TAC and BOBRO but there are other decent ones out there.
 
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