In competition, we have the Saigas, Vepr, and MK1919s. These take time and tweaking depending on what you get. Replacement parts are an issue, etc... It can be frustrating.
I came across this by accident,
http://www.hatsan.com.tr/en_new_escort_raider.html
http://www.hatsan.com.tr/assets/esco..._manual_en.pdf
Though it looks like a Turkish Benelli M4 clone with a magazine, it looks interesting nonetheless. It seems at some point some manufacturer of worth will be able to get a semi-auto shotgun right. Not saying this particular one is even close.
Will there ever be a reliable magazine fed shotgun in the US worth using for HD or duty use? Thoughts?