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The Tunder S14 is an assault rifle that appears in S.T.A.L.K.E.R.: Lost Alpha and S.T.A.L.K.E.R.: Shadow of Chernobyl.


An assault rifle combined with a grenade launcher. It is a very good type of assault rifle for the Zone conditions: it is compact, reliable, but universal and powerful. The Tunder S14 is one of the favorite rifles of the military stalkers.
- Inventory description

Overview

  • The OTs-14-4A Groza was introduced in 1994 by the TsKIB SOO (Central Design and Research Bureau of Sporting and Hunting Arms) in Tula, Russia.
  • Internally it is an exact copy of AKS-74U but in a bullpup configuration (action and magazine behind the trigger group) and chambered for 9x39mm ammunition.
  • Two variants exist in the game: "Tunder" 5.45 and in the Developer's Cut Personal "Tunder" 5.45 (v1.4000+).

Upgrades

Lost Alpha

List of upgrades
Level 1 upgrades.

Semi free roller locking system:

  • Price: 3600 RU
  • A roller locking system increases accuracy.
    • Accuracy: +12%


Expanded magazine:

  • Price: 4200 RU
  • Change standard magazines for larger ones.
    • Magazine: +10



Level 2 upgrades. Stop drive:

  • Price: 4200:
  • A synthetic installed behind the end of the step slide compresses it to increase accuracy.
    • Accuracy: +13%


Self sealing barrel:

  • Price: 4500 RU
  • A special mechanism that seals the barrel when firing, maximizing internal pressure.
    • Accuracy: -10%


Additional gas piston:

  • Price: 3360 RU
  • A second gas affects the slide mechanism, compensating for the recoil, which has a positive effect on the accuracy.
    • Recoil: +32%


Accelerated refire rate:

  • Price: 3600 RU
  • Despite its name, it replaces the regular bolt with an exposed bolt system: it should provide a higher rate of fire.
    • Rate of fire: +15%



Level 3 upgrades. Balancing parts:

  • Price: 4200 RU
  • Polymer parts which rigidly fix spring trajectory, reducing the sway.
    • Accuracy: +8%


Smoothing spray application:

  • Price: 4500 RU
  • The spray smooths out minor flaws in weapon mechanics, significantly increasing muzzle velocity.
    • Accuracy: +5%


Lock sealing couplings:

  • Price: 4500 RU
  • Sealing couplings help increase the pressure in the barrel and the muzzle velocity.
    • Accuracy: +4%


Ergonomically shaped receiver:

  • Price: 4320 RU
  • A more convenient shape of the grip makes handling weapon more comfortable, especially when firing on the move.
    • Handling: +16%


Receiver counterforce rotator:

  • Price: 4080 RU
  • A counterforce rotator installed in the receiver reduces weapon recoil.
    • Recoil: +26%


Lock gas amplification:

  • Price: 4320 RU
  • The lock's speed is amplified through the use of powder gases and a modified closing mechanism, significantly increasing the rate of fire.
    • Rate of fire: +26%


Short stroke gas piston:

  • Price: 4200 RU
  • Optimizing the gas piston increases the rate of fire.
    • Rate of fire: +10%


Rollback moderator:

  • Price: 3720 RU
  • Special slide parts compensate the movement of the slide, reducing recoil.
    • Recoil: +49%

Developer's Cut

List of upgrades
ID Icon Upgrade Description
Cost Effect Requirements
1A Ui inGame2 upgrade GromS14 1.png Accelerated refire rate Despite its name, it replaces the regular bolt with an exposed bolt system: it should provide a higher rate of fire.
2300 RU

Rate of fire +10%

Tools for rough work (v1.4005+)

1C Ui inGame2 upgrade GromS14 2.png Additional gas piston A second gas piston affects the slide mechanism, compensating for the recoil, which has a positive effect on accuracy.
2400 RU

Recoil -20% (v1.4002) / -15% (v1.4005+)

1D Ui inGame2 upgrade GromS14 3.png Slide protective coating A protective coating increases the tightness of the receiver box, which positively affects reliability.
2400 RU

Reliability +15% (v1.4002) / +20% (v1.4005+)

1E Ui inGame2 upgrade GromS14 4.png Short stroke gas piston Optimizing the gas piston increases the rate of fire.
3200 RU

Rate of fire +25% (v1.4002) / +20% (v1.4005+)

1F Ui inGame2 upgrade GromS14 5.png Semi free roller locking system A roller locking system increases accuracy.
3300 RU

Accuracy +30% (v1.4002) / +25% (v1.4005+)

2A Ui inGame2 upgrade GromS14 6.png Receiver counterforce rotator A counterforce rotator installed in the receiver reduces weapon recoil.
2000 RU

Recoil -10%

Tools for rough work (v1.4005+)

2C Ui inGame2 upgrade GromS14 7.png Self sealing barrel A special mechanism that seals the barrel when firing, maximizing internal pressure.
2400 RU

Bullet velocity +20% (v1.4002) / +15% (v1.4005+)

2E Ui inGame2 upgrade GromS14 8.png Rollback moderator Special slide parts compensate the movement of the slide, reducing recoil.
3400 RU

Recoil -30% (v1.4002) / -20% (v1.4005+)

2F Ui inGame2 upgrade GromS14 9.png Stop drive A synthetic part installed behind the end of the step slide compresses it to increase accuracy.
3400 RU

Accuracy +30% (v1.4002) / +25% (v1.4005+)

3A Ui inGame2 upgrade GromS14 10.png Additional return spring Installing additional springs with a reverse spiral can reduce the recoil without affecting bullet trajectory.
2000 RU

Recoil -10%

Tools for rough work (v1.4005+)

3C Ui inGame2 upgrade GromS14 11.png Balancing parts Polymer parts which rigidly fix spring trajectory, reducing the sway.
2400 RU

Accuracy +20%

3D Ui inGame2 upgrade GromS14 12.png Return mechanism protective coating A protective coating increases the reliability, and most importantly, further isolates the receiver from the environment.
2400 RU

Reliability +15% (v1.4002) / +20% (v1.4005+)

3E Ui inGame2 upgrade GromS14 14.png Lock sealing couplings Sealing couplings help increase the pressure in the barrel and the muzzle velocity.
3300 RU

Bullet velocity +25% (v1.4002) / +20% (v1.4005+)

4A Ui inGame2 upgrade GromS14 15.png Receiver counterbalance An enhancement mounted on the front of the receiver that reduces recoil.
2000 RU

Recoil -10%

Tools for rough work (v1.4005+)

4C Ui inGame2 upgrade GromS14 16.png Ergonomically shaped receiver A more convenient shape of the grip makes handling the weapon more comfortable, especially when firing on the move.
2500 RU

Handling +15% (v1.4002) / +25% (v1.4005+)

4E Ui inGame2 upgrade GromS14 17.png Modular receiver A modification of the bull-pup receiver that makes its maintenance easier.
3400 RU

Reliability +25% (v1.4002) / +30% (v1.4005+)

4F Ui inGame2 upgrade GromS14 18.png Smoothing spray application The spray smooths out minor flaws in weapon mechanics, significantly increasing muzzle velocity.
3300 RU

Bullet velocity +30% (v1.4002) / +20% (v1.4005+)

5A Ui inGame2 upgrade GromS14 19.png Expanded magazine Change standard magazines for larger ones.
2750 RU

Mag. size +10


Notes

  • Does not need to be upgraded in order to use the scope and silencer attachments.
  • Though its upgrades are expensive, this weapon can be made into one of (if not the most) accurate assault rifles in the game.
  • Ammo is rare and is most often found in Traders shops.
  • The PRM Weapon Pack in v1.4007 changes the weapon:
    • Silencer no longer attachable
    • Instead of the standard Warsaw Pact scopes only the PO 4x34 scope (introduced in the PRM Weapon Pack) can be attached

Trivia

Gallery

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