I did a Form 1 on an old Wingmaster and cut it to 12". Just so happens I listed 14.5" as on the addendum. Thanks for sharing.
3'' barrels will work on a 2.75" receiver. The receiver may not function with a 3" shell however.
So everybody should be good with either barrel. Barrels that are marked 2 3/4'' or 3" are 3'' chambers.
Sounds like they're all 3'' barrels. Those have been around a long time. The Police Magnum was 3'', barrel and receiver.
In the P-F basket of deplorables.
OK, with the barrel ordered... what is the best way to put a dot on an 870P? My receiver is not tapped for picatinny rail. If there are gold-standard shops I will probably use them. Wilson Combat seems to offer this for $150, could do worse but open to competing offers.
Please @ me if anyone finds 14" 590 grs barrels
Those sights seem lower profile than the standard slug sights. I'd be concerned that a pic rail would make them unusable.
Drilling and tapping for the pic rail is a pretty straight forward job, you could do it yourself if you have a drill press and a drill press vise. Any local gunsmith should be able to do the job without a problem and save you the time and trouble of shipping.
Another thought might be a sidesaddle-rail combo. I've used both Mesa and Tac-Star side saddles, but not the rail versions. I'd favor Mesa over Tac-Star because the Tac-Star's seem more prone to stripping the threads in the side plates.
https://www.mesatactical.com/product...2-ga-5-in.html ($120.00)
https://www.amazon.com/TacStar-Indus.../dp/B00I77PNUA ($74.00)
Adding nothing to the conversation since 2015....