Microsoft announced on the Halo Waypoint that the weapons in Halo 4 multiplayer would be retuned on the 3rd June.
The weapons affected included:
Battle Rifle
* The Battle Rifle rate of fire has been slightly decreased.
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The Battle Rifle red reticle range (range at which auto-aim benefits kick in) has been decreased.
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Two bursts from a Battle Rifle followed by a melee will now kill an opponent (2-shot melee).
Carbine
* The Carbine damage has been increased. The Carbine is now capable of killing in seven rounds.
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The Carbine accuracy has been increased (projectile spread decrease).
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The Carbine red reticle range has been decreased.
LightRifle
* The LightRifle zoomed rate of fire has been increased.
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The LightRifle un-zoomed rate of fire has been slightly decreased.
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The LightRifle red reticle range has been increased to match the updated DMR range.
DMR
- The DMR red reticle range has been slightly decreased.
Assault Rifle
* The Assault Rifle damage has been slightly increased. The Assault Rifle now kills in three less rounds.
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The Assault Rifle auto-aim angle has been reduced.
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The Assault Rifle projectile spread has been decreased.
Storm Rifle
* The Storm Rifle damage has been increased. The Storm Rifle now kills in three less rounds.
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The Storm Rifle auto-aim angle has been reduced.
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The Storm Rifle projectile spread has been decreased.
Suppressor
* The Suppressor damage has been increased. The Suppressor now kills in three less rounds.
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The Suppressor auto-aim angle has been reduced.
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The Suppressor projectile spread has been decreased.
SAW
* The SAW’s damage has been increased to maintain double the damage-per-second of the Assault Rifle.
Magnum
* The damage has been slightly increased. The Magnum is still capable of killing in six rounds.
Vehicles
* The damage has been increased on both the Mantis and Warthog Chain Gun.
Finally, base player movement has been increased by 10%. Additional info about matchmaking and playlists can be found here.