The Gun Mettle Update was a major update that introduced weapon skins, 4 new maps, and 3 new taunts. It also introduced the Gun Mettle Campaign, a three-month event allowing players to complete skill-based contract challenges to unlock one-of-a-kind weapons and exclusive weapon cases. To participate in the Gun Mettle Campaign, players had to obtain the Gun Mettle Campaign Pass, which was available for purchase in the Mann Co. Store.

Additional content was further added in the August 27, 2015 Patch with the introduction of the Gun Mettle Cosmetic Case.

Class Weapon Changes

Changed: Increased amount of Boost lost on air jump to 75% (from 50%)



Shortstop Changed: No longer uses secondary ammo and now uses primary ammo instead

Changed: Healing and knockback passives are only active when weapon is deployed

Changed: Damage vulnerability from +50% fire to +20% all sources while active

Changed: Passive effects on the Pretty Boy's Pocket Pistol are only in effect when the weapon is deployed

Removed: +15 max health on wearer



Fan O'War Added: Crits whenever it would normally mini-crit

Changed: Reduced damage penalty to 75% (from 90%)

Changed: Reduced blast radius penalty to 10% (from 15%)

Changed: Reduced damage penalty to 15% (from 25%)

Changed: Reduced self blast damage reduction to 15% (from 25%)



Black Box Changed: +15 health on hit to +20 health on hit per attack

Changed: Changed how health on hit works for radius damage. Is now capped per attack and scales with total damage done relative to base damage. (i.e. doing 45 damage nets +10 health on hit as base damage is 90. Hitting 3 enemies for 45 each for a total of 135 damage only returns +20 health)



Escape Plan

Equalizer Changed: No healing penalty to 90% less healing from Medics while active



Pyro

Flare Gun Added: Added text to describe 100% critical hits on burning targets



Scorch Shot Changed: Reduced damage penalty to 35% (from 50%)

Added: Increased knock back on burning targets

Changed: Increased the blast radius from flares from 92Hu to 110Hu

Added: 100% minicrit chance vs burning targets



Detonator Changed: Slightly increased blast jump height when doing a Detonator jump

Changed: Increased blast radius to 110Hu (from 92Hu)

Changed: Detonated explosions now also Mini-Crit burning targets

Added: Added text to describe 100% Mini-Crits on burning targets

Changed: Increased damage penalty to -25%

Changed: Increased self-damage penalty to 50% (from 25%)



Powerjack Changed: Reduced health gained on kill to 25 (from 75)

Changed: Changed +25% charge on charge kill to +25% charge on melee kill



Loch-n-Load Changed: Damage bonus now only applies to buildings



Iron Bomber Removed: Damage penalty on self-detonate

Changed: Reduced radius penalty to 15% (from 20%)



Tide Turner Changed: Self damage will no longer decrease charge when charging

Changed: Fall damage will no longer decrease charge when charging

Changed: Reduced amount of charge taken away on damage when charging reduced to 1 per point of damage (from 3)



Quickiebomb Launcher Changed: Damage is now increased based on charge amount when the bomb is fired.



Ullapool Caber Changed: Reduced explosion base damage to 75 (from 100)

Changed: Reduced damage ramp up bonus for close range attacks, now the same as other explosive weapons



Claidheamh Mòr Changed: +25% charge on charge kill to +25% charge on melee kill



Tomislav Added: 20% more accurate (less spread)

Changed: Increased faster spin up speed to 20% (from 10%)



Natascha Added: 20% damage resistance while spun up

Added: Stun amount now has distance falloff, decreases starting at 512hu down to zero stun at 1536Hu



Family Business Added: +15% faster firing speed



Dalokohs Bar Changed: Can now overheal up to 400hp

Added: Alt-fire to throw and share as a small medkit for other players to use

Added: 10 second cool down on use



Eviction Notice Added: 3 second speed boost on hit



Engineer

Pomson 6000 Changed: Uber and Cloak drain decreases over distance from target, decreases start at 512hu from target and reaches 0 drain at 1536hu



Rescue Ranger Changed: Reduced cost of long range building pick up to 100 metal (from 130 metal)



Wrangler Changed: Ammo and repair given to a shielded Sentry is reduced by the strength of the shield (66% reduced) when shield is active

Changed: Engineer death keeps the Wrangled sentry shielded and disabled for 3 seconds, same as when Wrangler is switched away. (Previously Engineer death caused disable state for only 1 second)



Short Circuit Added: Projectile destruction has been moved to alt-fire at the cost of -15 per shot. There is a 0.5s cool down between attempts and refire

Added: Cannot pick up buildings when the Short Circuit is deployed



Gunslinger Changed: Mini Sentry Guns can now be repaired

Changed: Mini Sentry Guns can now be Wrench construction boosted

Changed: Mini Sentry base build speed decreased. Mini Sentry Guns that are Wrench boosted build slightly faster than previously

Changed: Mini Sentry Guns start at 50% health on construction and gain health during construction instead of starting at 100%

Changed: Metal gibs from destroyed Mini Sentry Guns no longer grant any metal



Jag Added: +15% swing speed

Changed: With the change to Base Construction boost, Jag bonus has improved. 30% increase of 1.5x makes a total of 1.95x (total of 2.95x when base speed is added)

Added: 20% repair penalty (Repairs will give up to 80hp per swing instead 100hp per swing)



Eureka Effect Changed: Previous penalties have been removed and replaced with the following:

Added: Construction hit speed boost decreased by 50%

Added: 50% less metal from pickups and Dispensers



Medic

Vaccinator Added: Vaccinator Über deploys now always take exactly 1 bar of Übercharge.

Added: Vaccinator Über deploys give the patient a 2.5 second bubble of 75% damage resistance of the current resist type and full crit resistance to that type. These bubbles do not disappear if the Medic stops targeting the current patient. Multiple bubbles of different types can be applied to the same patient or multiple patients given the same resist Über each consuming 1 charge.

Changed: Vaccinator Über build now suffers the same penalties as other Mediguns when it comes to multiple Medics on the same target and max overhealed patients

Changed: Reduced the bonus healing a Medic received for properly selecting the right damage resistance type from 25% of incoming damage to 10% of incoming damage

Added: Penalty of 66% decreased Übercharge build rate while healing a overhealed patient



Solemn Vow Added: Added 10% attack speed penalty



Sniper

Sydney Sleeper Changed: Jarate now applies on all scoped shots, duration scales with charge duration (2 to 8 seconds)



Bazaar Bargain Changed: No longer lose heads on miss

Changed: Now requires 2 headshot kills to be back at base speed and 6 kills for 200% charge rate

Changed: Each head boosts charge rate by 25% up to 200%

Changed: Collecting a head requires a headshot kill and not just a headshot

Changed: Increased charge rate penalty changed to 50% (from 25%)



Cozy Camper Removed: Increased damage taken penalty



Bushwacka Changed: Changed penalty from +20% fire vulnerability to +20% damage vulnerability while active



Spy

Enforcer Changed: +20% damage bonus while undisguised to +20% damage bonus while disguised



Spy-cicle Added: Spy-cicle recharge timer can now be reduced by picking up ammo boxes

Changed: Changed fire immunity for 3 seconds to fire immunity for 1 second and 10 seconds of afterburn immunity

Removed: Silent killer attribute



Big Earner Added: 3 second speed gain on kill



Conniver's Kunai Changed: Reduced health penalty reduced to -55 health (from -65 health)

Changed: Increased minimum health gain of 75 on kill

Changed: Increased maximum overheal from Kunai increased to 210 (from 195)



Cloak and Dagger Added: Can now pick up ammo kits for cloak meter while visible. Previously could not pick up ammo packs for cloak. Cloak gain is at a reduced rate when compared to stock Invis Watch on ammo pick up



Dead Ringer Added: When Feign Death is triggered, the Spy receives a 3 second speed boost

Changed: Initial attack that triggers feign death has its damage reduced by 50%

Changed: Feign Death stealth has no bump shimmer for 3 seconds

Changed: Increased drain rate to a decreased drain rate. Overall duration of invisibility is still 7 seconds when accounting for initial spend of 50% cloak meter for triggering Feign Death

Changed: Reduced cloak regen rate from to 50% faster (from 80%)

Added: Triggering Feign Death instantly removes 50% cloak meter

Changed: Damage resistance on triggering feign death scales over time. 65% to 20% over 3 seconds

Changed: 3 seconds after triggering Feign Death, the Spy is under normal invisible conditions (20% armor and shimmers if bumped or shot)

Changed: Can no longer pick up ammo for cloak meter while cloaked



Disguise Kit Added: Pressing 'reload' (Default bind: R ) also toggles the disguise team.

Added: 50% faster switch to speed