Whatever you think of it, you gotta love this rude gesture to the NFA and to the gun grabbers - a mag fed Shockwave:
https://www.guns.com/2018/06/27/mossberg-brings-detachable-magazine-590m-shockwave-to-market/
https://www.guns.com/2018/06/27/mossberg-brings-detachable-magazine-590m-shockwave-to-market/