Yes, pump shotguns require sufficient force to operate the action to extract and eject a shell and chamber another shell from the tubular magazine. The 870 is a very well-designed, well-made and very reliable pump shotgun. I've purchased 5, inherited 2 and sold only one. I just wish all 870 models were available in left hand versions. Since they aren't, all of my 870 shotguns are right hand models.
NRA Life Member - RMEF Life Member - Vietnam Vet