If memory serves correct the ammo saddles that screw into the side of the receiver won't work because the pins are not located in the exact same position. I may be wrong about that though
Not so the pins are in the same location as on the 870 receiver and receiver side saddles will fit. The 870 trigger guard assembly will also fit the Pardner Pump.
870 Parts that fit:
Mag cap, shell latches, safety, forend assembly, receiver stud on most there are a few PP shotguns that have a metric thread pattern, Bolt, extractor and barrel if you relocate the barrel lug ring
870 Accessories that fit:
Forends but they will be a tight fit because the Pardner Pump forend tube is a little larger diameter, Stocks but some need a little fitting, receiver shell side saddles, tactical oversize safeties, tube extensions but they will be too long or too short.
H&R NEF Pardner Protector, they have very thick steel receivers thicker than the 870, machined extractor & ejector and nicer aluminum trigger guard than the one offered on the 807P. They are deal for the money.
Protector Breacher with one of my 7+1 tube extensions I make for the Hawk 982 and Pardner Protector shotguns.
Protector Breacher
King Armory Breacher Brake
GC 7+1 Tube Extension
Vang safety
Hogue forend
SpeedFeed LE short stock
Shotgun has a Ceramic non rust finish applied over the factory parkerized finish
Action smoothed
Wolff spring & a steel follower
Spark II fiber optic sight
Fiber glass heat shield
Recoil is low for a 12Ga pump because of the pistol grip stock and the excellent King Armory brake.
GC