Compared to the stock Medi Gun, the Quick-Fix heals players 40% faster and builds ÜberCharge 10% faster, but can only overheal up to 125% rather than 150%. It can maintain, but not increase, overheal over 125% obtained from another source. Since its maximum overheal is lower than the 142.5% ÜberCharge build rate penalty threshold, it can build ÜberCharge twice as fast as the stock Medi Gun, on top of the aforementioned 10% build rate boost.
Deploying the ÜberCharge triples the healing rate and heals the Medic at the same rate (granting him up to 125% overheal), while also providing immunity to all movement-impairing effects, such as knockback, stun, and slowdown. The charge does nothing to reduce incoming damage, making it ineffective against lethal burst damage. The reduced healing penalty applied under the effects of afterburn still apply under the Quick-Fix's ÜberCharge. While ÜberCharge is deployed, the Medic and his patient cannot capture or block a point, or push/block the cart, but they can carry the intelligence.
Like other Medi Guns, healing with the Quick-Fix allows the Medic to match the speed of a faster target. However, it also mirrors a patient's explosive jump or shield charge, sending the Medic an equal force in the same direction, allowing him to follow teammates that launch themselves across the map (although after the initial force the Medic must control his own flight). This effect only functions when healing a Soldier, Demoman, or Pyro, and only works on Medics directly healing the patient (effect cannot be transferred across a chain of Medics). When healing a patient firing a Grappling Hook, the Medic travels in the same direction at the same speed, remaining suspended until the hook is released or their healing beam is disconnected. Any kills that a patient gets are counted as an assist to the Medic.
December 23, 2010 Patch
- [Undocumented] Added stats for Quick-Fix.
June 23, 2011 Patch (Über Update)
- The Quick-Fix was added to the main game. It only operates on base class speed (speed-granting weapons do not affect it), lacks the blast jump mirror attribute, and cannot overheal at all.
- [Undocumented] Lowered ÜberCharge rate from 40% to 25%.
June 27, 2011 Patch
- Fixed the Quick-Fix showing the fire overlay when running in DX8.
June 28, 2011 Patch
- Added/Refined recoil/draw/Crit/reload forces for the Quick-Fix.
July 7, 2011 Patch
- Fixed a bug where Medics using the Quick-Fix could easily identify disguised Spies.
- Fixed a bug where healing a Scout while they change class in the spawn room would allow the Medic to keep the Scout speed.
- [Undocumented] Added team-colored overlay for Quick-Fix users during the ÜberCharge.
July 18, 2011 Patch
- [Undocumented] Fixed a mistake for the Quick-Fix blueprint displaying refined instead of reclaimed as the required metal for crafting.
August 3, 2011 Patch
- Fixed a case where health overheal wasn't being applied when multiple healers were involved.
January 26, 2012 Patch
- Fixed a bug where the Medic would lose his healing target's speed when deploying his ÜberCharge while using the Quick-Fix.
February 2, 2012 Patch
- [Undocumented] Added Strange quality.
April 17, 2012 Patch
- [Undocumented] The Quick-Fix no longer maintains overheal.
April 18, 2012 Patch
- Fixed the Quick-Fix's "immunity to movement-impairing effects" attribute not being honored by the Pyro's airblast.
- Fixed the Quick-Fix not maintaining overhealed health.
June 27, 2012 Patch (Pyromania Update)
- Medic mirrors blast jump of their heal target.
- [Undocumented] The Quick-Fix now gains speed from all sources of speed increase, such as the Eyelander and Gas Jockey item set.
August 10, 2012 Patch
- Fixed a Medi Gun exploit that could leave players indefinitely invulnerable.
July 10, 2013 Patch
- Changed attributes:
- Added 50% Overheal.
- Über now affects the Medic when there's no heal target.
- Shotguns with pushback (Force-A-Nature) no longer affect players under the effect of Quick-Fix’s Über.
July 11, 2013 Patch
- Fixed Quick-Fix infinite heal exploit.
July 24, 2013 Patch
- Medics using the Quick-Fix will now take jump force from Pyros using the Detonator to explosive jump.
- [Undocumented] Medics using the Quick-Fix will now take jump force from Pyros using the Scorch Shot to explosive jump.
August 28, 2013 Patch
- Fixed an outdated tip for the Quick-Fix.
February 7, 2014 Patch
October 30, 2014 Patch
- Updated the
equip_region
for the Quick-Fix.
January 15, 2015 Patch #1
- Fixed the Medic not being able to deploy a Quick-Fix charge while carrying the flag.
July 2, 2015 Patch #1 (Gun Mettle Update)
- Updated description to better detail the weapon's features.
July 8, 2015 Patch #1
- Fixed the Scorch Shot knockback from affecting Quick-Fix Über.
December 17, 2015 Patch (Tough Break Update)
- During setup time, ÜberCharge build rate is now increased by 3x.
- Fixed cases where Quick-Fix ÜberCharged players could still be affected by certain knock-back effects.
- Changed attribute:
- Players can no longer capture objectives while under the effects of Quick-Fix ÜberCharge.
January 7, 2016 Patch
- Fixed the Quick-Fix not healing the Medic after switching away from the Medi Gun and back while the charge is draining.
July 7, 2016 Patch (Meet Your Match Update)
- A dropped Mediguns's stored ÜberCharge begins to decay over time after coming to rest
- Changed attributes:
- ÜberCharge rate reduced to +10% (from +25%)
December 21, 2016 Patch (Smissmas 2016)
December 13, 2017 Patch
- Fixed Quick-Fix Medics not properly following/mirroring the Pyro after launching with the Thermal Thruster.
July 24, 2025 Patch (Summer 2025 Update)
- Fixed the Quick-Fix occasionally failing to mirror the patient's Wall Climbing