The UDP Compact is a .45 ACP pistol that appears in S.T.A.L.K.E.R.: Shadow of Chernobyl, S.T.A.L.K.E.R.: Clear Sky, S.T.A.L.K.E.R.: Call of Pripyat, and S.T.A.L.K.E.R. 2: Heart of Chornobyl.
Appearances
Shadow of Chernobyl
A reliable weapon. As a quality compact close-range weapon, it is very popular among the Zone veterans.
Shadow of Chernobyl in-game description
The UDP Compact has significantly better firing rate compared to other .45 caliber pistols and very light, weighing less than 1.00kg.
However the UDP seems to be susceptible to jamming, which makes it slightly unreliable in extended firefights.
Acquisition
In Shadow of Chernobyl, the UDP is heavily employed by veteran and Expert Freedom members as their sidearm and sold exclusively by Skinflint.
It can also be obtained from the stash Goodies in the safe in the Red Forest.
It is used as a sidearm by the following characters: Barin from Duty, Charon from the Monolith, Father Diodor of the Loners, Leshiy, Lukash and Murk from Freedom.
Clear Sky
This trustworthy weapon boasts German quality and reliability. The compact short-range weapon is especially popular with the Zone's veterans. Uses .45 ammo.
In-game description
In Clear Sky, the UDP Compact is used by expert members of Freedom and some experienced members of the Mercenaries and veteran Loners . It is still very light, weighing at less than 1.0kg and its magazine can be expanded by 4 bullets to have a total of 12 bullets per magazine. It has a better firing rate than other .45 caliber pistols and retains a degree of accuracy and power, though not as powerful nor as accurate as a Kora-919. Most technicians can upgrade the weapon.
Acquisition
It is sold only by Ashot, though one can salvage one early in the game while fighting the mercenaries in the Dark Valley. The player can only buy this pistol from Ashot after attaining a friendly reputation with Freedom. It can be retrieved from the Dangerous stash in the Red Forest.
Upgrades
The UDP Compact shares the same upgrades as all pistols.
Upgrades marked in green are accuracy upgrades, while those marked in red are rate of fire upgrades. They are mutually exclusive.
 Bolt mechanism modification (750 RU)  Fire rate +25%A technological modification of the bolt mechanism allows for a higher rate of fire.
 Bolt mechanism modification (750 RU)  Recoil -20%Careful adjustment of the bolt mechanism increases the weapon's precision.
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 Barrel modification (1125 RU) Recoil -50%Installing a muzzle brake allows recoil to be reduced significantly.
 Barrel replacement (1125 RU)  Flatness +30%An upgrade for weapons with integrated silencers. Replaces the combined barrel and silencer with a solid barrel.
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 Barrel modification (750 RU)  Weight -20%Careful adjustment of the bolt mechanism increases the weapon's precision.
 Barrel replacement (750 RU) Flatness +20%This durable steel barrel resists deformation and allows for better bullet acceleration.
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 Soft trigger (750 RU)  Accuracy +20%A smooth trigger pull allows firing accuracy to be increased.
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 Anatomical grip (750 RU) Accuracy +20%Tailor-made ergonomic grip designed specifically for you.
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 Extended magazine (750 RU)  Mag. size +4Increasing magazine capacity using improvised means.
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Unique variants
- .223 pistol - an unused variant of the UDP Compact chambered in .223 FMJ that is found in the game files. It is a reference to the namesake weapon from Fallout 2.
Call of Pripyat
Impeccable reliability and durability combined with excellent accuracy are the main noteworthy features of this weapon. Its minor drawbacks include its considerable size, relatively high center of gravity and massive bolt, which make it difficult to conceal but do not outweigh the weapon's positive features. The weapon is especially popular with the Zone's veterans.
Call of Pripyat in-game description
Upgrade view
In Call of Pripyat, the UDP Compact is one of the pistols that can be modified to have a new firing mode – in this case, fully automatic. It is the only .45 caliber pistol with this upgrade. It can also mount a silencer.
Compared to its previous iterations, the pistol now has a 12-round capacity by default, which can be upgraded to 16, making it the best non-unique pistol of the game capacity-wise behind the HPSS-1m.
Acquisition
The UDP Compact is used by Mercenaries, Loners, Freedom and sometimes even Zombified Stalkers. All of the mercenaries encountered during the side mission Kopachy carry it as their sidearm.
The UDP Compact is sold by Hawaiian after obtaining the achievement A Friend of Duty, and by Owl after obtaining the achievement One of Ours.
Notable users:
Upgrades
 Moving bolt section (600 RU)  Fire rate +10%Provides an increase in rate of fire without overloading other parts through additional recoil.
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 Polymer recoil buffer (1000 RU)  Recoil -20%A small buffer that takes on some of the recoil.
 Increased bolt movement (1000 RU)  Flatness +20%By increasing bolt movement and reinforcing the return mechanism appropriately, you can improve flatness.
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 Fully automatic firing mode (3000 RU)  Automatic fire modeModernization of the pistol's automatic parts suitable for automatic fire.
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 Long barrel section (600 RU) Flatness +10%Replacement of a regular barrel with a longer one improves accuracy and flatness, but reduces the rate of fire.
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 Installation of a barrel with a simplified rifled section (1000 RU) Fire rate +15%A simplified rifled part is useful for close quarter combat where the emphasis is on the rate of fire rather than accuracy.
 Chrome plating of the internal side of the barrel (1000 RU)  Reliability +15%Chrome plating improves the barrel's life cycle.
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 Sinusoidal rifling of barrel (1400 RU) Fire rate +25%Allows barrel heat to be reduced and increases the rate of fire without sacrificing flatness.
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 Titanium frame (600 RU) Reliability +10%An expensive frame for a weapon that will serve a long time.
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 Changing handle shape with a straight rear section (1000 RU)  Handling +15%A change in the rear section makes for a more ergonomic handle shape.
 Amortization handle (1000 RU) Recoil -20%An amortization handle reduces recoil.
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 A handle with a changed shape with replaceable plates (1400 RU) Recoil -30%The possibility of choosing a suitable plate makes for a more ergonomic handle shape.
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 Double trigger firing mechanism (600 RU)  Accuracy +10%The trigger is armed by the first shot, with all other shots occurring during automatic trigger arming.
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 Modular firing mechanism (1000 RU) Reliability +15%A modular firing mechanism provides easier maintenance and parts replacement, as well as certain improvements in ease of use.
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 Installation of an arming component (1400 RU) Accuracy +30%The arming component considerably reduces the amount of pressure required on the trigger, improving accuracy.
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 Increased magazine capacity (1600 RU) Mag. size +4Magazine capacity increase without increasing weapon part length.
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Unique variants
- March - a unique UDP Compact sold by Nimble, said to have belonged to Wolfhound. It features lower recoil and higher accuracy than the stock UDP Compact.
Heart of Chornobyl
A pistol known for its ergonomic design, accuracy, and reliability. Widely favored in the Zone, it is sought after by both professionals and affluent newcomers.
In Heart of Chornobyl the UDP Compact returns. It offers a solid upgrade from the PTM, both in terms of magazine capacity and damage. Ammo is relatively easy to come by as .45 ACP rounds is often found at traders.
Acquisition
- Sold by Eugene in Rostok.
- Frequently used by Mercenaries and Noontide.
- One mint condition UDP Compact can be found at Vovchyk Koldyba's stash at the Pig farm.
- Another mint condition UDP compact can be found underground in a stalker stash, accessible from the empty foundations southeast of Rudnya-Veresnya.
Upgrades
Color-coded upgrades are mutually exclusive. Prices based on Stalker difficulty.
 Balanced Handle (250  ) Readiness 20%Shifts the weapon’s center of gravity, enabling a faster transition to combat stance.
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 Individual Adjustment (500 ) Moving while aiming 30%Customizing the grip to match the shooter’s hand maximizes comfort when handling the weapon.
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 Return Mechanism Sleeve Tightener (350 ) Bullet range 25%Increases barrel pressure, resulting in increased muzzle velocity.
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 Modified Gas Block Geometry (800 ) Reduced damage drop-off 30%Enables the bullet to retain energy longer in flight.
 Extra Barrel Rifling (800 ) Armor-piercing power 50%Reduces bullet deterioration within the barrel to preserve its intended design characteristics.
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Modules
 Laser Designator (4600 ) Aiming speed 5%
Spread decrease 20% +0.5kgA laser designator facilitates faster, easier aiming at short and medium range.
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Unique variants
- Deadeye - A unique UDP Compact with a pre-installed Compensator and Collimator Sight, owned by Faust.
- Gambit - A unique UDP Compact owned by Dr. Kryvenko. It is chambered in 9x19mm and also features a two-tone tan finish.
Sounds
| Shadow of Chernobyl | Clear Sky | Call of Pripyat | |
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| Draw | |||
| Holster | |||
| Shoot | |||
| Empty | |||
| Reload | |||
| Close | |||
Gallery
Shadow of Chernobyl
Clear Sky and Call of Pripyat
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