Guy asked for a custom Halo "Plasma" laser pistol. Blue laser, colorshifting paint, some lights. Best I could do with his budget. Still Halo as F, I am very happy with it! :
HALO NATION® Musical Gun Toy Pubg M9 Gun Toy with Light Music Vibration Laser & Torch Light - Realistic Spy Detective Pistol Gun Toy with Silencer - Music Laser Gun Space Gun
Best BR75 Battle Rifle Loadout Halo Infinite Season 3 [A-Tier]
M6 Spartan Laser - Weapon - Halopedia, the Halo wiki