When John Browning designed the self-loading shotgun that became the Auto-5, he broke from his long partnership with Winchester, asking for royalties instead of a one-time payment for his patent.
Opinion
Forgotten Weapons on MSNOpinion

Why making a self-loading shotgun is so difficult

I think a lot of people under appreciate the difficulty of making a reliable self-loading shotgun. Between the rimmed case, wadcutter-type cylindrical shape, varying shell length, and massive ...
You cannot shoot a shotgun without loading it first, and you absolutely have to know how to load and unload a gun if you’re going to use it safely. Not every shotgun loads as intuitively as you might ...