5.56x45mm MK 318 Mod 0 (SOST)
Table of contents

5.56x45mm NATOup to armor class 3
5.56x45mm NATO round: damage 53, penetration 33, armor damage 39 %, velocity 902 m/s. Ranked 5 of 12 in the caliber by penetration.
Stats
| Stat | Value |
|---|---|
| Caliber | 5.56x45mm NATO |
| Damage | 53 |
| Penetration | 33 |
| Armor damage | 39 % |
| Muzzle velocity | 902 m/s |
| Fragmentation chance | 35 % |
| Ricochet chance | 35 % |
| Bleeding (light / heavy) | +15 % / +10 % |
| Accuracy | +2 % |
| Recoil | +3 % |
| Tracer | no |
| Flea Market | 591 ₽ |
In-game description
A 5.56x45mm NATO MK 318 Mod 0 (SOST) cartridge with a 4 gram open-point bullet with a lead core over a copper base with a copper jacket, in a brass case. The cartridge was specially designed for the United States Marine Corps, under the name SOST (Special Operations Science and Technology) to provide penetration of objects with low structural strength and provide a considerable stopping power effect, even being able of piercing basic ballistic body protections.
Against which armor
Penetration 33 is above the resistance of class 3 armor (30) — while such armor is intact, the round penetrates it more often than not. Against class 4, penetrations are rare until the armor is worn down.
For example, the vests it can defeat: BNTI Kirasa-N body armor, 6B23-1 body armor (EMR), BNTI Zhuk body armor (Press). The full table is in the armor classes guide.
Comparison with other rounds of the same caliber
| Ammo | Damage | Penetration | Armor damage | Velocity, m/s | Frag. | Armor class | Flea Market |
|---|---|---|---|---|---|---|---|
| 38 | 57 | 58 % | 1013 | 30 % | 5 | — | |
| 42 | 53 | 52 % | 1013 | 42 % | 5 | — | |
| 49 | 44 | 47 % | 945 | 44 % | 4 | — | |
| 52 | 38 | 44 % | 940 | 43 % | 3 | 991 ₽ | |
| 53 | 33 | 39 % | 902 | 35 % | 3 | 591 ₽ | |
| 54 | 31 | 37 % | 922 | 50 % | 3 | 444 ₽ | |
| 57 | 23 | 33 % | 957 | 50 % | 2 | 205 ₽ | |
| 60 | 18 | 26 % | 874 | 33 % | 1 | 177 ₽ | |
| 72 | 11 | 24 % | 936 | 3 % | 1 | 105 ₽ | |
| 79 | 7 | 22 % | 947 | 70 % | — | — | |
| 88 | 3 | 11 % | 936 | 90 % | — | 182 ₽ | |
| 6mm BB subsonic | 1 | 1 | 0 % | 70 | 35 % | — | — |
Ammo on the radar
- The enemy marker is labeled with their weapon and the distance to them: you know in advance at what range the fight will start and which ammo to load.
- A “Notify” rule for the ammo you need: when it is spotted in the raid, a notification pops up with the distance and price.
The radar map opens from a link in any browser: on a phone, tablet, laptop or second monitor. You can also share it with friends from your squad.

Questions and answers
What is the penetration of SOST?
Penetration 33, damage 53, armor damage 39 %. It penetrates fresh armor up to class 3 more often than not.
Which weapons can fire it?
Caliber 5.56x45mm NATO: M4A1, AK-101, AK-102, HK 416A5, ADAR 2-15, Desert Tech MDR 5.56x45 assault rifle, TX-15 DML, FN SCAR-L 5.56x45 assault rifle, FN SCAR-L 5.56x45 assault rifle (FDE), G36 and others.
Is it the best in its caliber?
By penetration — ranked 5 of 12; higher: SSA AP, M995, M855A1.
How much does it cost?
About 591 ₽ each on the Flea Market per the price snapshot.