Where are you located?
Even Mercedes craps out a lemon car every now and then. I have express tactical and have had zero issues with it. Remington needs to make this right for you.
Read this thread for my brothers adventures
http://www.mdshooters.com/showthread.php?t=118442
I've had good results with Mossberg brand shotguns.
I hear you, but returning it to Remington is a PITA. I am never home and shipping is a nightmare. I am not anti-Remington, but the workmanship on this gun is pretty sad. I have a cheap Chinese 870 copy that is at least as nice. My first shotgun was an 1100 LT20, and what I bought is no where to that level.
What kind of shells? Some 870's have been finicky with the winchester short aluminum case top shells. Switch ammo and see if you get the same jam. When I fired other brands of #7 or #8 shot, it worked fine, I just never bought the winchester shells anymore