Zebra62 posted photos of his Remington 870 shotguns with Mesa Tactical sidesaddles on Remington 870 Forum:

Mesa Tactical Sidesaddle for Remington 870

Mesa Tactical Sidesaddle for Remington 870

Mesa Tactical Sidesaddle for Remington 870

Mesa Tactical Sidesaddle for Remington 870

Mesa Tactical Sidesaddle for Remington 870

Mesa Tactical Sidesaddle for Remington 870

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Mesa Tactical Sureshell Holder

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Get Mesa Tactical Sureshell Holder on Brownells