Everyone has weapon designs they like so here are mine for the UNSC and Covies
UNSC
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Assault Rifle: Halo 4/H2A - DMR: Halo 4 - Battle Rifle: Halo 4 concept art - SMG: H2A - Magnum: Reach - Sniper: H2A - SPNKr: H2A - Rocket launcher(if in game): Halo 5 but darker colors - Shotgun: H2A - Machine gun turret: Halo 3 or Halo 4Covenant
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Plasma pistol: Reach - Carbine:H2A - Plasma Rifle: H2A - Plasma turret: Halo 4 - Fuel rode: Halo 4 - Beam rifle: Halo 4