OK, fair enough. In regard to this thread, do you own a Wilson Combat and an 870P? I do, as mentioned in the thread on Wanstall's dealer forum. What I can tell you (again) from personal experience is that there is a difference. I'm not disputing the fact the raw receiver is quite possibly the same, but to claim that the WC and 870P uses the exact same as the Express except for paint (Armor-Tuff,Parked,etc) is something I've found to be incorrect. The insides are smoother and free of any burrs or machining marks. Also, while the barrel from the WC may be originally from an Express, the chamber is very smooth as is the rest of the length, there's no comparison to the Express nor the Police for that matter. An yes, the 870P has better fit/finish than my Express.
No one is disputing the fact all 870 receivers come off the same forge, but why is it impossible that the ones destined for pricier guns receive extra care, like polishing and deburring? As an analogy, just because several gunsmiths use a Rem 700 SPS action as their choice for a custom build, it doesn't mean you're getting an untouched factory 700 SPS action on your new gun.