Great Deal, Perfect Item
This offset Surefire light mount worked perfectly for attaching my M620v (the style with further apart base screws not the new close ones) to a standard picatinny rail on my AR-15. Durability and extremely reliable, as I've come to expect from Surefire. Not usable with non-Surefire lights (except maybe clones) or with the new lights that have the close together base screws. One thing to consider is, the light attached to this mount then put on a side rail will keep the light pretty flush along the side of your gun; make sure theres room for the light considering any other rail attachments (flip up sight in my case).
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