These are some simple mods for the Nerf Bigshock. I removed the outer shell of the blaster because I prefer the simple, smaller blaster that it is on the inside, and some of these mod parts are only able to be attached after removing the outer shell.

The ST adapter is a friction fit adapter that will allow you to use Spring Thunder shells with the blaster. You need to remove the air restrictor in order for it to work, and a spring upgrade would also benefit it. The diameter of the blaster insert part of the adapter is intentionally a little small so that electrical tape can be used to get an ideal fit and air seal. The diameter is also the same as a standard Nerf faux barrel as well as many scar barrels, which allows this to be friction fit into the Nexus Pro and Aeon Pro as well.

The holster is assembled in two parts in case the part that attaches to the blaster breaks so that you don't have to re-print the whole part assembly. A minor amount of sanding may be needed in order to make the insert fit snug. The blaster clips into the holster insert and holds it in place very well. I sized the gaps in the holster to fit my belt, which is about 37.5mm wide, so unless you redesign the part, you'll need a same size belt or smaller.

The "thing" is meant to attach a standard Nerf faux barrel to the blaster. Those barrels can fit inside of a Mega XL dart snug, and a barrel for standard darts can be secured inside of the faux barrel, giving additional utility to the blaster. This part probably isn't useful for anyone other than myself, but I'm adding it to the mod group just in case anyone else is interested in it.