That link makes me believe that they have chokes? I thought they were cylinder bore?
Its from XS sites. It came off a factory 870 tacticalBBB: What rail is that with the integrated ghost ring?
Also, I love my Grizzly 12.5. Mine was from the first batch that came in without the ghost rings.
Love mine! Took a deer this season from about 10 yards with the ghost rings, all 8 pellets in the kill zone! My main complaint is the feed ramp; it's a bit too long and contacts the shell in the mag tube sometimes.
I've gotten rid of the red dot but here's a few pics:
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