Lost Alpha Wiki

The SGI 5k 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.

A relatively new assault rifle for the 5.56x45 mm SS109 round. This weapon is very popular due to its accuracy, soft recoil, and high reliability.
- Inventory description



Lost Alpha

Developer's Cut

List of upgrades
ID Icon Upgrade Description
Cost Effect Requirements
1A Ui inGame2 upgrade SGI 5K 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.
1400 RU

Rate of fire +10%

Tools for rough work (v1.4005+)

1C Ui inGame2 upgrade SGI 5K 3.png Longitudinal grooves Adding oblique grooves to the frame of the weapon helps reduce friction of moving parts and protects them from dirt, increasing weapon reliability.
2200 RU

Reliability +25%

1D Ui inGame2 upgrade SGI 5K 4.png Incident slide This slide slides along the stem, preventing the muzzle from climbing when firing.
2200 RU

Recoil -20%

1E Ui inGame2 upgrade SGI 5K 3.png Slide protective coating A protective coating increases the tightness of the receiver box, which positively affects reliability.
2900 RU

Reliability +30%

2A Ui inGame2 upgrade SGI 5K 5.png Receiver counterforce rotator A counterforce rotator installed in the receiver reduces weapon recoil.
1300 RU

Recoil -15%

Tools for rough work (v1.4005+)

2C Ui inGame2 upgrade SGI 5K 6.png Inertia moderator Installed on the back of the receiver, this modifications slows down the slide, increasing the weapon's accuracy.
2200 RU

Accuracy +20%

2E Ui inGame2 upgrade SGI 5K 7.png Rollback moderator Special slide parts compensate the movement of the slide, reducing recoil.
2900 RU

Recoil -25%

2F Ui inGame2 upgrade SGI 5K 8.png Stop drive A synthetic part installed behind the end of the step slide compresses it to increase accuracy.
2900 RU

Accuracy +30%

3A Ui inGame2 upgrade SGI 5K 9.png Barrel with cooling fins A more efficient ventilation system allows the weapon to work faster.
1400 RU

Reliability +15%

Tools for rough work (v1.4005+)

3C Ui inGame2 upgrade SGI 5K 10.png Barrel with simplified rifling Reducing the amount of rifling cut into the weapon increases the rate of fire, but on the other hand, the weapon won't be as useful for target shooting.
2200 RU

Rate of fire +10%

3D Ui inGame2 upgrade SGI 5K 11.png Additional rifling Installing a barrel with additional rifling increases the velocity and accuracy of the weapons.
2200 RU

Bullet velocity +15%

3E Ui inGame2 upgrade SGI 5K 12.png Barrel with sinusoidal rifling Sinusoidal rifling improves barrel cooling, increasing the rate of fire.
2900 RU

Rate of fire +10%

4A Ui inGame2 upgrade SGI 5K 13.png Impact-resistant polymer frame Replacing the base frame with a polymer one can reduce the mass of the weapon without compromising its reliability.
1800 RU

Weight -0.7 kg

Tools for rough work (v1.4005+)

4C Ui inGame2 upgrade SGI 5K 14.png Ergonomically shaped receiver A more convenient shape of the grip makes handling the weapon more comfortable, especially when firing on the move.
2200 RU

Handling +25%

4E Ui inGame2 upgrade SGI 5K 15.png Hollow grip with stabilizer A stabilizer is installed inside the hollow grip, reducing recoil.
2900 RU

Handling +30%

4F Ui inGame2 upgrade SGI 5K 16.png Smoothing spray application The spray smooths out minor flaws in weapon mechanics, significantly increasing muzzle velocity.
2900 RU

Bullet velocity +25%


5A Ui inGame2 upgrade SGI 5K 17.png Expanded magazine Change standard magazines for larger ones.
2350 RU

Mag. size +10

5C Ui inGame2 upgrade SGI 5K 1.png Three round burst mode Installing an additional trigger module allows to fire short controlled bursts.
2300 RU

3 round burst mode


  • Can be equipped with the M203 grenade launcher.
  • Can be equipped with the Silencer for 5.56 mm.
  • Does not need to be upgraded in order to use any of its attachments.
  • Weapon is not changed by the v1.4007 PRM Weapons Pack.