From Halopedia, the Halo wiki
Model series:
M6
Type:
Directed-energy weapon
The M6V Spartan Laser is a UNSC directed-energy weapon.[1][2] It is one of a myriad of variants of the M6 Grindell/Galilean Nonlinear Rifle, an initially exorbitantly expensive weapon which underwent several refinements and iterations to reduce its cost.[3]