The Season 4 patch for Call of Duty: Modern Warfare 2 is currently live on all platforms, and it has brought several changes. Alongside the usual set of buffs and nerfs that refresh this title's meta each season, S4 offers several content improvements. From new maps and weapons to the last Atomgrad Raid episode, Season 4 has a lot to offer.All of these new changes and content updates have been listed in the Season 4 patch notes of Modern Warfare 2.Modern Warfare 2 Season 4 patch notesHere is the Season 4 patch note of Modern Warfare 2 as mentioned in the official Call of Duty blog.GLOBALWelcome to Season 04!We’ll dive deep into all of the new content coming this Season below, but just a few highlights include:1) Run this town: welcome to Vondel, our all-new medium-sized map!Jump into the Assault on Vondel Event at Launch2) Fight your way through six new Multiplayer Maps, including new Core, Gunfight, and Battle Maps3) Update your Loadouts with three new weapons:Tempus Razorback Assault RifleISO 45 SMGTonfa Melee Weapon4) The introduction of DMZ’s new Forward Operating Base (FOB), a centralized hub for all communications and Operator upgrades within DMZKeep reading for all the intel on this update, including new content, balance updates and bug fixes! For regular updates about live issues, patch notes and status updates from all studios and studio partners, follow @CODUpdates, launching with Season 04.STABILITYThis update contains several fixes to reduce the number of known crashes. We continue to prioritize increased stability and crash fixes across all platforms.Studio teams have made meaningful progress in deploying several server-related fixes and upgrades over the last few weeks. We have seen significant performance improvement in several areas of concern including crashes. We remain committed to tracking and pursuing these issues and will continue to share progress.OPERATORSNew OperatorsNiktoNikto Modern Warfare 2 (Image via Activision)The former FSB deep-cover agent was first spotted in Modern Warfare® (2019), using his menacing signature black mask to cover the disfiguration of his face caused by Mr. Z. A methodical and calculated soldier, Nikto is a natural-born leader who appears to fear nothing, with next to no gaps in his skill set as the ultimate soldier of fortune.Ana VegaThe daughter of paramedics and Army reservists with family roots in Cuba, Ana Vega never had the opportunity to get to know her parents. Both were killed during rescue operations in the early days of the Urzikstan conflict. The Gold Star child followed in their footsteps in attempt to reconnect with her fallen parents, graduating with top honors from the United States Military Academy and enlisting in the Army’s Combat Medic Specialist Training Program (CMSTP). Proving her exemplary proficiency in combat and as a medic, she eventually caught the attention of her commanding officer, who fast-tracked her to a position on a prestigious Special Forces unit with the 75th Ranger Regiment.Io (BlackCell)IO of Modern Warfare 2 (Image via Activision)[[REDACTED]].WEAPONSNew WeaponsTempus Razor Back: Assault RifleTempus Razor Back Modern Warfare 2 (Image via Activision)A masterclass in exceptional manufacturing, this Tempus Armament assault rifle features a bullpup design and frame-vibration control, resulting in a smooth and controllable full-auto 5.56 weapon.Unlock in Battle Pass Sector D13ISO 45: Submachine GunISO 45 of Modern Warfare 2 (Image via Activison)The ISO Platform’s answer to room clearing. This SMG dominates with a high fire rate and the stopping power of .45 Auto rounds.Unlock in Battle Pass Sector D19Tonfa: MeleeTonfa of Modern Warfare 2 (Image via Activision)This hard-polymer, edgeless melee weapon delivers blunt trauma without risk of dulling or breaking. Versatile, comfortable, and lethal in the right hands.Unlock via Assault on Vondel EventGeneralShotgunPellets now use damage priorityIf more than four pellets hit a target, the highest damage among those hit pellets will be usedMeleeFist Lunge Range decreasedGunbutt Lunge Range decreasedGunbutt Damage decreased | Warzone OnlyWeapon BalancingThese changes to Player Health and the application of Armor Damage ultimately result in the Time to Kill feeling slower, more consistent, and more reactable at every engagement distance. While a select few Weapons are listed below, it is important to note that most Weapons will see their effectiveness altered as a result of the change to Armor Damage. For now, we will be retiring the term “Armor Damage” and any future changes that are Warzone specific will be followed by “Warzone Only.”Battle RiflesCronen Squall Full-AutoBullets to Kill increased by 2 | Warzone OnlyMaximum Damage increased | Warzone OnlyMinimum Damage added | Warzone OnlySemi-AutoBullets to Kill increased by 1 | Warzone OnlyMaximum Damage decreased | Warzone OnlyMinimum Damage increased | Warzone OnlyShotgunsBryson 800 Minimum Damage decreased | Warzone OnlyHead Multiplier increasedNeck Multiplier increasedUpper Torso Multiplier increasedArm Multipliers increasedLeg Multipliers increasedBryson 890 Minimum Damage decreased | Warzone OnlyHead Multiplier increasedNeck Multiplier increasedUpper Torso Multiplier increasedArm Multipliers increasedLeg Multipliers increasedExpedite 12 Minimum Damage added | Warzone OnlyLeg Multipliers increasedKV Broadside Mid Damage decreasedLockwood 300 Minimum Damage decreased | Warzone OnlyHead Multiplier increasedNeck Multiplier increasedUpper Torso Multiplier increasedArm Multipliers increasedLeg Multipliers increasedHip to ADS Spread transition speed increasedBecomes accurate faster after aiming down sightsMid Damage Ranges increasedMid Damage decreased slightlySubmachine Guns Fennec 45 Bullets to Kill decreased by 1 | Warzone OnlyAttachmentsFTAC Siege Akimbo FTAC Siege (NEW)Unlock through in-game Challenge: 25 Hip Fire Operator kills with the FTAC SiegeKastov-74u KSTV-17 Barrel (NEW)Added to Kastov-74u progression, replaces 5.45 Tracer at Level 9Players who have progressed beyond this level will have it retroactively granted to their account following the launch of Season 4 KV Broadside 12 Gauge Dragon’s BreathClose-range Damage increased slightlyBug FixesFixed an issue with the SZ Aggressor-IR Optic where its ADS penalty was higher than intendedFixed an issue with 12-Gauge Dragon’s Breath residual damage where it would be counted as a headshot for scoringFixed an issue that caused Death Effects to intermittently occur on incorrect bodiesFixed numerous incorrect Attachment unlock criteriaFixed an issue where the in-game challenge completed overlay for the KL40-M2 Drill underbarrel Attachment showed a placeholder nameFixed an issue causing the .300 BLK Overpressured +P ammunition to remain locked without unlock requirements, despite the Weapon being at max levelFixed an issue where Bipod Attachments were not blocked on some Weapons when using the canted iron sightsEVENTSNEW: Assault on VondelYour mission is to fight back against Nikto’s clandestine army, and reclaim the city in our seasonal event. The Assault on Vondel begins at the launch of Season 04 and goes through July 7. Earn rewards through two types of challenges during the event:Community Challenges: All Players must work together to gather medals through classic challenges, unlocking gameplay rewards such as the Taxi Boat and Trams, Reinforcement Flare Field Upgrade, the Favorite Supply Box and a brand new Tonfa melee Weapon.Mastery Challenges: Individual challenges that are directly tied to a cosmetic reward while also contributing to the Community Challenge. The most efficient way to get all cosmetic rewards is to land on Vondel, but playing across the game is also supported.BATTLE PASSBattle PassSeason 4 battle pass of Modern Warfare 2 (Image via Activision)Unlock 100 tiers of content in this season’s Battle Pass, featuring 2 new weapons, Nikto and more! Check out the Season 04 Battle Pass blog for all the intel, including BlackCell.GAMEPLAYMovement Parachute: Weapon Quick Raise is now always used when cutting your parachute or landing for improved responsiveness on landingPERKSAdjustmentsBomb Squad now scales both explosive damage and clamps the maximum damage unless the damage was a direct impactFIELD UPGRADESBug FixesField Upgrades now refund properly when shocked by a shock stick mid-deploymentThrowing Star kills now properly extend Battle Rage and Dead SilenceAUDIOAdjustmentsAdded ability for War Tracks to play in 3D positions from Vehicles in the world, rather than only to Players riding in a VehicleUI/UXNew FeaturesMultiple Attacker Notifier Quality of LifeWhen a Player is downed while simultaneously under fire from multiple enemy Players, a text notifier will appear near their crosshair indicating the total number of recent attackers.AdjustmentsAdded a new splash that calls out when a Player is downed or killed by more than one attackerPlayers can now view Skins for locked OperatorsAdded the ability to select Skins for Tacticals and Lethals… check out the new Wumpa grenade!Added the ability to remove all of your equipped attachments on your weapon by pressing and hold RT/R2 in Gunsmith.Improved clarity on which Attachments have Skins, are Tunable, or are Pro-TunedAdded the Pro-Tuned tag to the loadout preview widget for Blueprint-tuned WeaponsAdded Pros and Cons for all AttachmentsImproved usability of Loadout selectPerk Packages now use a double-stacked rowAdditions and improvements to the HUD for Search and Destroy and Rescue ModesAdded reticles and tracers to the Loadout preview in GunfightAdded a POI label under the Compass in GunfightGeneral visual improvements to the HUD in GunfightRedesigned AAR and Scoreboard to accommodate 6v6 and larger matchesGlobal Bug FixesFixed an issue where exiting the Tactical Camera would sometimes leave a blurry screenFixed an issue where the Player would have their controls locked if they tried to re-enter a Recon Drone as it dies, while looking through a Spotter ScopeFixed an issue where the Wheelson could be deployed on top of other vehiclesFixed an issue where the Player’s FOV would remained zoomed in after leaving control of the GunshipFixed an issue that prevented bots from being able to revive downed teammatesFixed an issue where Weapon progress trackers could become misaligned with their Weapons in the Weapon Challenges menuFixed an issue where the Buy Battle Pass menu launched abruptly when accessed for the second time while on View Map in the Battle Pass tabFixed an issue where the Operator could disappear when the Player enters the Emblem or Calling Card tab and goes backFixed an issue where Players could experience dropped frames when switching Calling Card tabsFixed an issue where loot could be destroyed if a Player died on top of an exploding vehicleFixed an issue where the Player would exit the Light Helo but still remain inside of itFixed an issue that could cause Players to end up in a broken state when performing a roof exit on a vehicle as it blew upFixed an issue where vehicles didn't collide with Players reviving other PlayersFixed an issue where collision sounds on the armor of the armored pickup truck didn’t playFixed an issue causing a number of missing vehicle icons in Ground War's Tac Map legendSPECIAL OPSCOOPERATIVEAdded display information when interacting with previously-claimed intel fragmentsThe number of intel fragments remaining for you in this missionsThe distance to the nearest unclaimed intel fragmentBUG FIXESFixed an issue with timers conflicting with one another during the puzzle in Atomgrad Raid Episode 01Fixed an issue where Players could crash if they used the Restart from Checkpoint feature in the maze in Atomgrad Raid Episode 01Fixed an issue where Players could crash if they lingered at a puzzle for a long time in Atomgrad Raid Episode 01Fixed an issue where the Oxygen Tank would disappear while ledge hanging in Atomgrad Raid Episode 01Fixed an issue where enemies would plant bombs in the wall in Defender: Hafid PortFixed an issue where Players that have not made a Custom Loadout will see overlapping default Loadout UIMULTIPLAYERMAPSCall of Duty@CallofDutyIt's a fight across luxury apartments in the Kunstenaar District Use vehicles for cover as you move up the main roads, and race across the map’s scattered interiors. More intel bit.ly/S04KunstenaarD…2701243It's a fight across luxury apartments in the Kunstenaar District 🏢Use vehicles for cover as you move up the main roads, and race across the map’s scattered interiors. More intel 👉 bit.ly/S04KunstenaarD… https://t.co/Xocu2rZ5NHKunstenaar District (Core 6v6)Located west of the Museum in Vondel, the Kunstenaar District (translation: Arts District) features a row of townhouses, boutique shops, a central plaza, and a swimmable canal along its west flank.Showdown (Core 6v6)Showdown map of Modern Warfare 2 (Image via Activision)The iconic map returns! It’s a great place to practice for those hot drops . . . or just drop airstrikes and helicopter Killstreaks with Gold weapons just like old times.Mawizeh Marsh (Battle Map)Mawizeh Marshlands is from the region of the Al Mazrah map containing the infamous River Diamond Luxury Resort . . . or what’s left of it.Ahkdar Village (Battle Map)Ahkdar Village of Modern Warfare 2 (Image via Activision)Action is mostly contained in the village (where Showdown is also located), and its most notable borders are the railroad to the south and the stepped farms and base of the mountain to the north. Vehicular combat may be frequent within the city walls, although infantry can take to the battlements, rooftops, and alleyways to counter them.Mercado (Gunfight)The Mercado is a section of Las Almas cleared out for Gunfight and Face Off battles. Combat within this large, covered structure will be frenetic on multiple levels, so get ready to stay close to your duo or trio, get in, and get out.Penthouse (Gunfight)Penthouse map of Modern Warfare 2 (Image via Activision)Time to take Gunfights all the way up to the top. The Penthouse, situated in the heart of Chicago, features a lap pool, an outdoor firepit, and a tight-angled modern interior.Bug FixesFixed various collision and/or geometry issue on MultiPlayer mapsFixed an issue on Guijarro where the Overwatch Helo would drop from the sky when leaving the MapPLAYLISTAdded Battle Map (12v12) Search and DestroyAdded Battle Map (12v12) Prisoner RescueAdded to Quickplay:10v103rd PersonInfectedGun GameDrop ZoneGrindGENERALAdjustmentsTuned spawns for Breenbergh Hotel, Black Gold, Exhibit, and Himmelmatt ExpoUpdated the rate at which UAV sweeps are performed for the infected team in Giant Infected:One sweep every 20 seconds by defaultOne sweep every 3 seconds when less than 24 survivors remainUpdated class tables to include Blueprints through Season 03 ReloadedMoved the bag locations from the top of barrels to the ground on Black Gold in Knock OutAdded “Score Limit” and “Time Limit” options for BountyAdjusted Weapon locations on Blacksite in Gunfight O.S.P.BUG FIXESFixed several exploits with the Tactical CameraFixed an out of bounds issue with the Recon DroneFixed an issue where Players would sometimes not receive the proper rewards when killing Players downed in Last StandFixed a connection timeout issue some Players would encounter in Drop ZoneFixed a bug where some melee kills would not count as one-hit-kills in One in the ChamberFixed an issue where some in-game Weapon challenge camo unlock text was cutoff and did not include the Weapon nameFixed an issue in Private Matches where the Player could not earn Killstreaks properly with the “Retain Streaks on Death” and “Persistent Streak Progress” options tuned onMWII RANKED PLAYSeason 4 brings multiple changes to Modern Warfare 2 Ranked Play (Image via Activision)MWII Ranked Play continues in Season 04, featuring NEW Seasonal Rewards including the Pro Re-Issue Vaznev-9k! Whether you’re jumping into your first Ranked Play match or continuing your grind, there’s more to unlock and competition to face. Below are the Season 04 specific details to keep in mind for returning competitors and further below is a full refresher for all players.Season 04 Highlight ChangesHere are the highlights for returning Season 03 competitors.Competitive Game Modes, Maps, and SettingsUpdated Minimum Level requirement for Ranked Play entry: Level 45New Season 04 RestrictionsAssault RiflesTempus RazorbackSMGsISO 45MeleeTonfaSR (Skill Rating) and DivisionsEnd of Season Skill Setback Update: At the end of each Season, your ending Skill Division will determine where you start the following season:Bronze through Crimson I players are set back three Tiers below where they finished in the previous season.Example: A player ending Season 03 in Gold III will begin Season 04 in Silver III.Players Crimson II and above will start Season 04 in Diamond I.Season 04 RewardsSeason 04 Win RewardsThroughout the Season 04, players can earn the following rewards:5 Wins: ‘Season 04 Competitor’ Weapon Sticker10 Wins: Pro Re-Issue Vaznev-9k Weapon Blueprint25 Wins: ‘Please Rotate’ Weapon Charm50 Wins: ‘Lock it Down’ Large Weapon Decal75 Wins: ‘MWII Ranked Play Season 04’ Loading Screen100 Wins: ‘MWII Season 04 Ranked Veteran’ Weapon CamoEnd of Season Division RewardsAt the end of each Season, players will be awarded Skill Division rewards that represent their highest attained Division that Season.Division Skins: Earn a Skill Division Skin for use with both CDL Male & Female Operators on both Factions to represent your highest Skill Division. Once the Skins from one Skill Division have been unlocked they can be permanently used in following Seasons and anywhere you play:Top 250: Unlock the ‘Top 250 Competitor’ Skin by finishing a Season in the Top 250 Skill Division. Players must be in the Division at the end of the Season to qualify for this reward.Gold - Iridescent: Earn the applicable ‘Gold Competitor’, ‘Platinum Competitor’, ‘Diamond Competitor’, ‘Crimson Competitor’, or ‘Iridescent Competitor’ Skin based on your highest Skill Division reached over the course of the Season.Seasonal Division RewardsEach Ranked Play Season features a unique set of Division Rewards awarded at the end of the Season to celebrate the player’s highest Skill Division reached that Season.The Season 04 rewards are as follows:Top 250: ‘Season 04 Top 250’ Weapon Charm, Emblem, and Calling CardIridescent: ‘Season 04 Iridescent’ Weapon Charm, Emblem, and Calling CardCrimson: ‘Season 04 Crimson’ Weapon Charm and EmblemDiamond: ‘Season 04 Diamond’ Weapon Charm and EmblemPlatinum: ‘Season 04 Platinum’ Weapon Charm and EmblemGold: ‘Season 04 Gold’ Weapon Charm and EmblemSilver: EmblemBronze: EmblemRanked Play First Place: The player who finishes Season 04 in the #1 position on the Top 250 Leaderboard will receive a unique, one-of-a-kind Calling Card and Emblem for the ultimate bragging rights.Complete MWII Ranked Play RefresherHere’s a complete overview of MWII Ranked Play for new Season 04 players!Competitive Game Modes, Maps, and SettingsRanked Play continues in Season 04! Play competitive, 4v4 matches using the same maps, modes, and settings used in the Call of Duty League 2023 ruleset.Updated minimum Level requirement for Ranked Play entry: Level 45Select Weapons, Attachments, Equipment, Perks, Field Upgrades, and Streaks are restricted.New Season 04 RestrictionsAssault RiflesTempus RazorbackSMGsISO 45MeleeTonfaGame Modes and Maps:CDL Search and DestroyAl Bagra FortressBreenburgh HotelEl AsiloEmbassyMercado Las AlmasCDL HardpointAl Bagra FortressBreenburgh HotelEmbassyMercado Las AlmasZarqwa HydroelectricCDL ControlBreenburgh HotelEl AsiloHimmelmatt ExpoSR (Skill Rating) and DivisionsTest yourself against your peers and track that progress with a visible SR (Skill Rating) that determines your place across 8 Skill Divisions.All new Ranked Play players begin their journey in Bronze I with 0 SR.Players increase their SR by winning matches and lose SR whenever they lose matches.Both individual and team performance will impact how much SR you gain or lose per match. In higher Skill Divisions, team performance has a bigger impact on SR gained or lost so that all winning playstyles are more consistently rewarded.Players can progress through eight Skill Divisions by reaching SR milestones:Bronze – Starting DivisionSilver – 900 SRGold – 2,100 SRPlatinum – 3,600 SRDiamond – 5,400 SRCrimson – 7,500 SRIridescent – 10,000 SRTop 250 – 10,000+ SREnd of Season Skill Setback: At the end of each Season, your ending Skill Division will determine where you start the following season:[Updated] Bronze through Crimson I players are set back three Tiers below where they finished in the previous season.Example: A player ending Season 03 in Gold III will begin Season 04 in Silver III.Players Crimson II and above will start Season 04 in Diamond I.Ranks and RewardsMWII Ranked Play is the most rewarding competitive Call of Duty experience ever, with a variety of valuable rewards available to players at launch and Season after Season.Unlocked Rewards can be used in Modern Warfare 2 and Call of Duty®: Warzone™ 2.0. Unlock what the mode has to offer to show off your Rank and Skill wherever you play.Ranked Play now features brand new Season 04 Rewards!Ranks and Rank RewardsSeparate from the player’s SR and Skill Division is Rank. Rank persists across Seasons to celebrate the player’s lifetime win total across their Ranked Play career.All players start at Rank 1 and can progress to Rank 50.Players increase their Rank by winning matches to earn Stars. Each win grants one (1) Star. Win enough matches and you’ll earn enough Stars to reach the next Rank.Every 5 Ranks players will progress their Rank icon and unlock a set of Rank rewards:Rank 5: Ranked Competitor Skin for use with both CDL Male & Female Operators on both Factions.Rank 10: ‘Press F’ EmblemRank 15: Pro Issue X12 Weapon BlueprintRank 20: ‘Ace’ Weapon CharmRank 25: ‘Turn It Up’ EmblemRank 30: ‘Ranked Win Tracker’ Gun Screen that displays the player’s lifetime Ranked Play win total.Rank 35: ‘I’m Cracked’ Large Weapon DecalRank 40: Pro Issue Combat Knife Weapon BlueprintRank 45: ‘Sweep’ Weapon CharmRank 50: Ranked Veteran Emblem & Skin for use with both CDL Male & Female Operators on both Factions.Each Rank Milestone also unlocks a Calling Card that represents the player’s achieved Rank.Season 04 RewardsIn addition to Rank Rewards, each Ranked Play Season will give players the opportunity to earn exclusive limited-time rewards.Throughout the Season 04, players can earn the following rewards:5 Wins: ‘MWII Season 04 Competitor’ Weapon Sticker10 Wins: Pro Re-Issue Vaznev-9k Weapon Blueprint25 Wins: ‘Please Rotate’ Weapon Charm50 Wins: ‘Lock it Down’ Large Weapon Decal75 Wins: ‘MWII Ranked Play Season 04’ Loading Screen100 Wins: ‘MWII Season 04 Ranked Veteran’ Weapon CamoEnd of Season Division RewardsAt the end of each Season, players will be awarded Skill Division rewards that represent their highest attained Division that Season.Division Skins:Earn a Skill Division Skin for use with both CDL Male & Female Operators on both Factions to represent your highest Skill Division. Once the Skins from one Skill Division have been unlocked they can be permanently used in following Seasons and anywhere you play:Top 250: Unlock the ‘Top 250 Competitor’ Skin by finishing a Season in the Top 250 Skill Division. Players must be in the Division at the end of the Season to qualify for this reward.Gold - Iridescent: Earn the applicable ‘Gold Competitor’, ‘Platinum Competitor’, ‘Diamond Competitor’, ‘Crimson Competitor’, or ‘Iridescent Competitor’ Skin based on your highest Skill Division reached over the course of the Season.Seasonal Division RewardsEach Ranked Play Season features a unique set of Division Rewards awarded at the end of the Season to celebrate the player’s highest Skill Division reached that Season.The Season 04 rewards are as follows:Top 250: ‘MWII Season 04 Top 250’ Weapon Charm, Emblem, and Calling CardIridescent: ‘MWII Season 04 Iridescent’ Weapon Charm, Emblem, and Calling CardCrimson: ‘MWII Season 04 Crimson’ Weapon Charm and EmblemDiamond: ‘MWII Season 04 Diamond’ Weapon Charm and EmblemPlatinum: ‘MWII Season 04 Platinum’ Weapon Charm and EmblemGold: ‘MWII Season 04 Gold’ Weapon Charm and EmblemSilver: EmblemBronze: EmblemRanked Play First Place: The player who finishes Season 04 in the #1 position on the Top 250 Leaderboard will receive a unique, one-of-a-kind Calling Card and Emblem for the ultimate bragging rights.Competitive Integrity FeaturesFrom Start to Finish: Players who disconnect or quit matches will receive SR penalties as well as temporary suspensions, with escalating penalties for repeat offenders.SR Forgiveness: If a player disconnects or quits in the middle of the match, all team members outside of that player’s party will not lose ANY SR.It is still possible to earn SR if players can overcome their disadvantage, but a loss at a numerical disadvantage will not yield SR loss for players outside of the leaving player’s party.Fair Fights, Even Teams: If a player quits or disconnects before the start of a match, the match will be canceled and will not count. The remaining players will be returned to the main menu.Professional Conduct Only: Friendly Fire is enabled in Ranked Play per CDL rules. Repeated Friendly Fire will result in players being kicked from games and receiving penalties and suspensions.Demotion Protection: After advancing to a higher Skill Division, players will be granted temporary Demotion Protection and will not lose any SR within the first three games in the new Division. Following that initial protection, if players were to lose enough SR to be demoted, they will first be dropped to the minimum threshold of their current Skill Division instead of being demoted. Losing their next match will result in a demotion.Demotion Protection is also applied for the player’s first 3 games of each Ranked Play Season.Party SR Restrictions: To ensure competitive fairness and balance of matches in higher Skill Divisions, players in certain Divisions can only party up with players around their current SR. The player with the highest Skill Division in the party determines which Party SR Restrictions are used:Iridescent (Including Top 250) & Crimson: Can party with players within 1 Skill DivisionDiamond: Can party within 2 Skill DivisionsBronze - Platinum: Can party up without any restrictionsThere were the patch notes for Modern Warfare 2 Season 4.