Most often, the worst abuse a gun receives is the manner in which it's repeatedly closed.
Most shooters don't realize the damage they inflict by slamming shut, or even vigorously closing, their guns.
It's totally unnecessary.
No gun, however well designed, can accommodate the stress on the hinge pin & locking system that's caused by slamming a gun shut.
The gun, treated thusly, will rapidly loosen, requiring repair.
Shotguns are designed for repeated firings, but not for the stress of banging closure.
A doublegun should always be closed firmly, and hammerguns opened slowly, much like moving a heavy door that has a stained glass panel.
(from: Lock, Stock & Barrel, by Adams & Braden)