I like these guys

[midnight rambler]

From their homepage:


create your own genuine can of Whoop Ass

https://www.pantheonarms.com/

[Tumbleweed]

^ That looks pretty compact and also looks similar to the Windom Weaponry mcs4. The barrels on the mcs4 come off and go pretty quickly and they will fit in a bag 8"x 24". They come with a kit for .223/5.56, 7.62x39, 9mm and 300 BLK.