Early 2000's Dominion Arms Grizzly 870 clone or Norinco HP9.
Built like a tank and with all metal machined (not molded or compressed powder) trigger guards and perfect for upgrading to whatever tactical shottie you would want.
All 870 parts and accessories will fit, even most barrels. The fit and finish is very good and they are built like a tank. They have a slightly thicker steel receiver, machined solid aluminum trigger guard, plastic on the Express and compressed powdered aluminum on the 870P.
Better recoil pad. The Express pad is very hard. The softer and thicker recoil pad on them is secured by brass inserts in the stock and machine screws. The pad on the Express is held on by wood screws in plastic.
Better shell lifter design on them with no need for a Flexitab. If you can get a shell caught between the lifter and bolt on them you just pump the action and clear it. All 870 parts are a drop in fit on them even the bolt. That shows they are made to tight tolerances and specs.
They are also made and internally machined better than all the 870 Express models and are a far better deal. They are also mostly 3" shell versions unlike a lot of Remington's which are usually 2/4". It is way harder to find an older 3" Remington Wingmaster and they go for a lot more when you do.
They have a actual real parkerized finish. The 870 Express and newer Remington's have a bead blasted blue finish that doesn't provide any rust protection what so ever and often start rusting very soon after getting wet.
And have a machined real steel extractor, ejector & firing pin. On the 870 Express these parts are metal injection molded which fail more often. The polymer stocks on the Grizzly and HP9 shotguns are very thick, solid and made to last. The stocks on the 870 Express may look a bit nicer but are made of thin polymer, have a hollow feel & sound to them.
These shotguns are a heck of a deal and no used 870 version shotgun in the $250 - $350 price range can touch them for what they offer for the money.
Remington through H&R/NEF (they owned these companies) even imported and sold the Pardner Pump 870 clone which was made by Hawk Industries in China who was the maker of the Dominion Grizzly and HP9.