I have a few extra 870 barrels. I'm not sure of the length. It looks to me like I have two 30 inch and one 28 inch.
The 28" is a ventilated rib with a fixed modified choke.
None of them are new but they are in pretty good shape.
If you are interested in one of these let me know.
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Unless you cut it down, I don't think Rem. made a 25" bbl.
I'll bet it's 26". When you measure it's from the tip of the muzzle to the front of the bolt face when the bolt is closed.
I currently have a 23" Remington 870 fully rifled barrel with Nikon scope for sale on another forum. Here's the URL:
http://smith-wessonforum.com/accessories-misc-sale-trade/314270-fs-remington-super-slug-barrel-nikon-3-9-x40mm-scope.html
It is for shooting sabot slugs at deer or similar game. Accurate like a rifle out to 100 yards, less so beyond that.
Handy for hunting deer in states that don't allow rifles.
PM me if interested, or email me at [email protected].