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No, cause of the ribbed barrel

The BPU-870 unit is a kit specifically conceived to convert Remington 870 design pump-action shotguns into the bull-pup layout, and it will work on any Remington 870 variant and even with clones manufactured by other companies than Remington, although it's not compatible with 3.½-inch receivers, ribbed barrel versions, rifle-sights versions, and squared receivers. It will otherwise fit any other Remington 870-based pump-action shotgun, and will accept any barrel and feeding tube lenght.

Ribbed or vented barrels won't work, hope you didn't buy it yet.