Interesting photo from Afghanistan. Knight’s Armament RAS on Remington 870:

Remington 870 with Knight's Armament RAS used by Canadian Forces in Afghanistan

Remington 870 with Knight’s Armament RAS used by Canadian Forces in Afghanistan

Remington 870 with Knight's Armament RAS used by Canadian Forces in Afghanistan

Remington 870 with Knight’s Armament RAS used by Canadian Forces in Afghanistan

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How to Mount a Red Dot Scope to a Remington 870