Best option in my opinion is an ARMS #02 for a red dot, or an ACOG.
This
I ran one on one of my ARs for years, never any issue, held a zero perfectly. The mount gets "wedged " in the carry handle and tightened down rock solid. You can throw an optic on there with low rings, and your GTG!
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https://www.armsmounts.com/default.asp?mode=products&sub=mounts&id=[hsh]02%20Ext



























