BigShock Pump Grip for my Retaliator Pump Grip Barrel. Here are the rest of the filers needed: https://www.thingiverse.com/thing:2659419
This does need support material. To attach a Bigshock to the grip, unscrew the shell of the Bigshock and screw it back together with the 3d print in-between the shell's "extra dart storage" section.
here is the original bigshock attachment model used:https://www.thingiverse.com/thing:1732391