RE: Remington 453 SPR
It's a baikal MP 153 Imported from russia and remington renamed it. May be a few minor changes, but it is basically the same gun from what I understand. I have never seen one in a store though.
From what I understand it is a very good gun for the money. I would get one of them vrs a Charles Daley from the things I have read. And it shoots 3 1/2 inch shells as well.
The only downside is the availability of parts if something were to happen. I have seen simular 11-87's for under $400 new on sale. I think that would be a better shotgun, but you wouldn't have the magnum shell option. Or a used 11-87 or 1100.
Shotgunworld has a whole forum dedicated to them if you want to check it out. If you get one let us know what you think of it.
Paul