Yes.
Should. Yeah it most likely will there is practically no difference between the two so it should work nicely
The Express version of the 870 Remington is normally either 12 or 20 gauge. Gauge desigantion is marked on the barrels left, rear end.
Depends on what it is choked.
About $325-$350
The 870 Wingmaster is still made in .410
100-375 USD
Around $350 depending condition.
There are many places one might go to find a review for the Remington 870 Express. The most reputable resource one has is the Consumer Reports website.
Is it a Wingmaster or an Express? Can't be both.
No requirement that it has to be.
Midwayusa.com