I have managed to source parts to do "Detachable Ammo Box Upgrade to NERF Vulcan"
NERF Vulcan: Add a detachable ammo box to the bottom of the Vulcan, increasing ammo capacity to 125 rounds!
RM40 for DIY kit;
RM70 for full assembly (you'll need to drop off your Vulcan)
Note: NERF Ammo box required.
Meets Legal test for NERFTOUR events.
Pictures coming soon!
Disclaimer: Because this is a modification, I cannot guarantee that your blaster will work as well as a stock blaster. That's the risk all modders have to take.