I have 1187, 1100 and 3 870’s. Never a problem. Use the 1187 for sporting clays, trap and hunting, over 60,000 rounds..not a problem. Had to replace the o-rings a couple of times but not a problem.
I’ve used a remington 870 Wingmaster for over 40 years and never, never had any problems...In fact, the action of pumping a shell into the chamber instead of an autoloader has probably saved me many boxes of shells in all my years of dove shooting...That little action has prevented me from wasting another shot on a missed bird....