For the pump you could make it so when you push it back it pushes the dart up and it also opens a breech, then pussing it forwarl would lower the platform, (or whatever you use to raise up the dart), and close the breech. You might have to link the pump to the breech externaly though, which ouldn't lok very good.
I think it would be cool if you found a way to fit two at2ks in the shell of the double shot. A shotgun case for those would be sick, just sick. Then paint it.
Personaly, I think you should go for it. I think it would take alot of work and creativity, there for enhansing your modding potential. I wouldn't really use CO2 in one of my guns becasue I think that Ruins the hole point of nerf and manualy primeing your guns. Good luck and I hope for the best of it. Looking forward to seeing this.
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