I’m in need of one for the 590.Any popular brands/models i should look at?
Blackhawk makes a reasonably good one. I have used one before, and it seemed quite sturdy. If you want something more zoot, 3gungear.com offers one.
Check this out. It can be set up as a chest rig or shoulder bag bandoleer style.
http://originalsoegear.com/12gamicro.html
https://www.m4carbine.net/showthread.php?t=64151&highlight=shotgun
I bought one from Eagle Industries and it rides “shotgun” over my passenger seat daily. And it is made here in the good 'ol USA.