It can.
YES REMINGTON FIREBALL , OLD PRODUCTION. Also, a number of companies make AR pistols in .223.
Pistol
Remington's website has what you are looking for.
Greatly dependent on what rifle, shotgun, or actually even a pistol....
yep ... choate
There is no Remington Model 6 pistol, there has been however cases however of Remington Model 6 rifles converted to pistols by gun or "home" smiths. NOT Remington. As such the value is whatever someone will pay, but generally not much.
The value of a Remington UMC 32 caliber pistol actually depends on a number of factors. Some of these factors include the age and condition of the pistol.
Remington did not make a 44 cal double barrel pistol. The did however make a 41 cal (rimfire) the double derringer. (model 95) There's 3 type's, 5 models, and at least 15 variations some of which are quite valuable.
No
Yes, The receiver pins are the same as the Remington 870, so any stock that will fit the 870 will fit the 7400
350.00 if in fair to good shape.