Before you spend any $ on using a riser I recommend grabbing your rifle,scope and some play dough/bluetac/etc and mocking up where the scope needs to sit for proper eye relief.
Nearly every scope I have seen fitted with risers has had to be fitted to far back due the the very short length of a ar receiver rail.
The cantilever mounts were invented for a reason.
Whatever way you end up going, welcome to the $ pit that is ar15's
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