This is a magazine attachment for a PVC blowgun that I made. I scavenged the magazine holder off of a broken NERF Rampage then designed an adapter to connected it to my blowgun.
The blowgun doesn't function as well with the magazine on it due to the fact there is some pressure loss and air leaking but the ability to fire faster is worth it in my opinion. This was designed more as a proof of concept than a practical mod but it still turned out alright. In order to reduce the air leak a bit I wrapped the front of the dart pusher in duct tape to create a bit of a seal. Doesn't work great but its better than plastic on plastic.
I also included a rail attachment and stock adapter to attach a Barricade that acts as a nice grip for the sniper and a close range electric weapon.
I'll add the SolidWorks files soon if anyone wants to modify this to work with a different magazine holder or has any ideas on how to improve the seal or improve the design in any ways. If you have any improvement ideas but don't have access to SolidWorks let me know in the comments and I might modify the design if its a good idea and I can find the time.
If you orient this correctly you can probably get away with printing it without supports. I used supports to ensure my holes where the pvc attaches would print well but it probably isn't necessary.