I figured it how to use the regulator carry handle : r/Nerf
Get a new Motherboard Kit for NERF modulus Regulator C1295 After the Modulator Regulator C1295 is modified, the board can withstand the voltage of 12-20v Single / three / burst mode, dart
Nerf Modulus Regulator - Walmart.com
modulus_regulator_nytf17 | Blaster Hub
NERF Modulus Regulator Review - Full or Semi Auto at the flick of a switch
Nerf Modulus Regulator Review - ET Speaks From Home