The magazine clamp can be used to more securely retain aftermarket or factory magazine extensions, while at the same time offering flexible accessory mounting options near the shotgun muzzle. All Magazine clamps are available with a push-button quick release sling swivel or a two inch MIL-STD-1913 (NATO STANAG 4694) Picatinny rail that can accept standard weapon light mounts. The Magazine Clamp can also be used to mount one inch diameter weapon lights simply by clamping one side to the shotgun barrel and the other side to the light body (recommended for use with shotguns with tall front sight posts).
So far, Mesa Tactical clamps for the Remington 870 and Mossberg 930 shotguns only (they happen to have the same dimensions). Demand for additional platform support has been resisted because of the difficulty in supporting the wide variety of, for example, barrel diameters and other differences between shotguns within the same model series.
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This magazine/barrel clamp is awesome!!! I've installed it on my 870 Police Magnum and it fits great. It's square and flush with both the magazine tube and the barrel. I believe the previous reviewer installed it upside down. Mag side on the barrel. The included QD sling swivel is very nice. The QD cup allows full rotation. This allows attachment of a sling while an 870 with a Surefire forend is mounted on the gun without having the sling getting in the way of the light. The original Remington magazine clamp, with the old style sling swivel stud worked ok for attaching a sling but since the stud is on the bottom the sling would obstruct the light. This Mesa Tactical product is worth the money.
The part fits with much back and forth to align the screws. Then it sits on an angle not 90 degrees. Which gives it open edges to catch on things and is cosmetically not the best. I am returning item and looking for another manufacturer. Would not want to take on and off on. Regular basis. Not worth the high cost.