I am a brand new user, so I apologize if I am asking an old question. I have an 870 Express with a vent rib barrel. I would like to mount my Fenix flashlight to the barrel. I can find all sorts of mounts for 870s, but not with the rib vent. Can anyone point me to a mount that would work with that barrel?

Welcome to the Remington Owners Forum !!

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As far as the flashlight mount....you may want to try ElZetta mounts...

http://www.elzetta.com/

The rib shouldn't be that much of a problem. Most flashlight mounts don't wrap over the top of the barrel because that can interfere with the low-set sights many shotguns have.