I've been on action fantasy manga/manhwa streak as of late. And I've met with sword and magic for hundreds of times. It just left me bored.

So, is there any action manga/manhwa which utilizes guns in extensive way? Whether from colonial era, world war era, modern era or even futuristic ones.

Black Lagoon
Dendrobates
Teenage Mercenary
Full Metal Panic!
Mahou Tsukai Kurohime
Jormungand
Youjo Senki
Trigun Maximum
Rebuild World
Marginal Operation

~4400 manga completed
~1700 ongoing...