SOST
5.56x45mm MK 318 Mod 0 (SOST)
Updated Nov 3, 2026, 12:30 PM
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.
Flea market
Not eligible for the flea market.
- Min flea level
- 0
- Low (24h)
- Not eligible
- Offers
- Not eligible
Categories
Sell to traders
Properties
- Caliber
- 556×45 NATO
- Damage
- 53
- Armor damage
- 39
- Penetration power
- 33
- Accuracy modifier
- 0.02
- Ammo type
- bullet
- Ballistic coefficient
- 0.269
- Bullet diameter
- 5.7 mm
- Bullet mass
- 4 g
- Durability burn factor
- 1.15
- Failure To Feed Chance
- 1.0%
- Fragmentation chance
- 35.0%
- Heat factor
- 1.52
- Heavy bleed modifier
- 0.1
- Initial speed
- 902
- Light bleed modifier
- 0.15
- Misfire Chance
- 15.4%
- Penetration Chance
- 52.0%
- Penetration deviation
- 2
- Projectiles
- 1
- Recoil modifier
- 0.03
- Ricochet Chance
- 35.0%
- Stack size
- 80
- Stamina burn per damage
- 0.1584
- Tracer
- No
- Tracer color
- red