All Darts In One
This is a Barrel adapter for the Nerf Bighshock. Inspired by the Mk-Knockout MEGA XL, I decided to try to get MEGA XL and elite dart functionality out of a Bigshock. after some trial and error, I arrived at this design.

It is capable of breach and muzzle loading, (for full and half lengths) and will fire 5 different ammunition types, in the right environment you will never run out of ammo again.

To use this you need to disable the air restrictor

In order to achieve this I first removed the dart post with a Flathead screwdriver, then upon realizing that the air restrictor was rubber simply bent it out of the way and pulled the o ring of it. the barrel is designed to use the o-ring built into the Bigshock air restrictor, so you dont have to source your own, but warping with electrical tape will work.

once its complete, air restrictor out of the way and o-ring on it, you will be able to fire everything.

Performance

half lengths: exceptionally effective
full lengths: higher than Nerf average
mega: unchanged, maybe slightly better than before
rival: it works, dont put it too deep, or it will require multiple shots to get out, makes a fun pop noise
MEGA XL: if you are playing HVZ and have to shoot it (the reason this exists), it will go maybe 10 feet, its an emergency use only sort of thing but it does work.
2-3 half lengths: functional shotgun, does work well, put tightest dart at the back for best performance
grip mods shown are simply electrical tape, 2 full length darts and this https://www.thingiverse.com/thing:4322754