Id suggest you look to shotgun world.com. There is a lot of misinformation in this thread.
Contrary to what you are getting in this post, the current 870s are amongst the best Remington has ever made. They re-tooled a couple years ago and the machining is cleaner and the fit and finish is excellent...a big improvement especially in the express models which are now a darker satin finish that is much less prone to corrosion.
The ONLY weak spot in the current gun is the MIM extractor (which is in the wingmaster as well) is easily remedied should it become a problem...which it likely won't.
The only plastic in the new guns is the trigger group housing (express only, winemaster is still pot metal). This is a nice improvement as it wont break, scratch etc. The internals of the fire control group are the same as always...and as i eluded to don't let the polymer housing scare you away. Its an improvement.
The new guns also have a lifetime warranty.
Not that it matters but I own 11 Remington 870 and 1100 shotguns ranging from the 1950s to current...the current guns are the best of the bunch IMHO
