Weapons affected include the battle rifle, magnum, SAW, suppressor, storm rifle, assault rifle, DMR, light rifle, carbine, and the Mantis and Warthog chain guns. For instance, the battle rifle's rate of fire has been decreased and two bursts of fire followed by a melee will now kill an enemy. The carbine's damage and accuracy has been increased but its red reticule range has been decreased.
Additionally, the suppressor is now capable of killing in three less rounds and player speed has been increased by 10 percent for all multiplayer modes and playlists.
Matchmaking tweaks include assault rifle load-out in the "Slayer Pro" game mode in Big Team Infinity Slayer and Infinity Slayer. Capture The Flag overtime period has been increased from one minute to two minutes and King of the Hill hill point limit has been increased from 25 to 50, with the score to win changed from 150 points to 250 points.
Full details on Matchingmaking changes and weapon tweaks can be viewed on the Halo Waypoint blog. The blog post also features high-quality renders of the tweaked weapons for fans to use as wallpapers.