Quote Originally Posted by Yora View Post
Why are there no (popular) semi automatic shotguns? Is the pump action mechanism just cheaper to manufacture, is the recoil not strong enough, or are there issues with non-brass cartridges?
Not sure how you're using 'popular' but the Mossberg 930 SPX has some good reviews.

They're not cheap though - a good semi-auto shotgun is often at least twice the cost of an equivalent pump action. Historically, there have been reliability issues - but I think those have been solved. As long as you're willing to pay for it of course. ;)