As per aippi who is basically the guru of all things 870:
Thank you, rommelrommel. I've never heard of aippi, but that's an interesting perspective. If what he says is factual, he still doesn't dispute the differences below. These all factor into the much higher quality, reliability, and increased cost over the Express models, which I have owned, as well.
- 870 Police shotguns go thru a special 23 station check list – ranging from visual inspection, functional testing, test firing, and final inspection.
- All Police shotguns are assembled in a “special build area” at the plant in Ilion, NY. This section is secured and serves only to build LE and Military shotguns, with the same factory personnel working at that assignment each shift.
- All parts that enter the “special build area” are visually inspected by hand to ensure top quality and functionality
- The fore-end on the Express model is longer and not compatible with many police shotgun vehicle racks.
- The Police shotguns utilize the heavy duty SPEEDFEED Stocks and Fore-ends.
- The Express model will not allow for the addition of an extension tube without physical modification to the tube and barrel, which can nullify the warranty.
- The Express model has a BEAD BLAST BLUE finish while the Police models utilize either High Luster bluing or Parkerization.
- The Express model utilizes a synthetic trigger housing while the Police models use a compressed metal housing.
- The Police shotgun barrel is locked down with a “ball detent” system in conjunction with the magazine cap vs. a lesser grade “synthetic magazine spring retainer” lock down as used on the Express system.
- The receivers used in Police guns are “vibra honed” to smooth out rough finishes and remove burrs before parkerization or bluing.
- Police shotguns use machined ejectors and extractors, as opposed to powdered metal cast which are utilized on the Express models.
As I said earlier, my 870P's are as smooth and reliable as any Wingmatser I've owned, and finished just as nicely. One of these days I should take down one of each to compare internals, as I still tend to think there are differences, aside from just the extractor.