Stevens 311H with vent rib

[dtf08]

Hello, I'm knew to the forum, but I have lurked and enjoyed for some time. I recently came into possession of a Stevens 311 h with vent rib, 28" choked mod/full 20ga. Never heard of one like this and I am wondering how common are the vent ribs or if it's aftermarket ? It's a great field/small game gun that I will never part with. Just curious about it. Thanks in advance.

[Mad Dog]

Off the top of my head I can't remember when the H series started on that gun????

Can you give me a partial serial number to date it with and I'll look it up in the catalogs.

[Mike Armstrong]

Might be an experimental one, but I've never seen any of the 311 series with an original vent rib. They saved that for the "Fox" Model B that is a gussied up 311.

Suspect it was added by somebody that liked your 311 as much as you do!

Any markings on it? Try a magnet, is it aluminum or steel? "Glued" on, screwed on, or soldered? All these details would give you clues (as would a tiny stamped name like "Simmons" or "Poly Choke".....common aftermarket brands).