re: Quick question: Remington 870 vs 870 express

Don't buy into all that tacticool shite. Extended magazine tube, and a shortened stock or adjustable stock.

Then get some real world advice on how run it. These things will beat the shite out of you if you mount it like a regular shotgun. Shorten the stock and move the butt plate in toward the middle of your chest under your dominant eye. The recoil will be less and hurt less with the shotgun moved in toward the center line of your body.