I've had good luck with my SDS S4 Benelli M4 clone. It's a Turkish made shotgun if you're wondering where it was made. I would consider it a kit, it's something you may have to work on and perhaps tweak a little bit. But you're only paying $384 as opposed to what it would cost for a real Benelli M4. At the same time, you're not getting Benelli quality control either. I haven't had any failures to fire using buckshot and slugs but I have had issues with Federal light target loads. I think the actual Benelli also has issues with the light target loads as well.
https://www.georgiagunstore.com/sds-s4-semi-12ga-18-5-5rd-blk.html
https://www.georgiagunstore.com/sds-s4-semi-12ga-18-5-5rd-blk.html