Headshot = 115%
Torso = 100%
Legs = 90%
Total HP (Normal mode) = 150 units (150,000)
Damage Formula = Damage x Bullet Speed x (Where it hits)%
^ This formula explains why the MP5, although having similar damage to the AK, the AK is the one with higher firepower. It's because of the bullet speed.
Example:
Theoretical Damage of AK when it is a headshot = 103 x 240 x 115% = 28,428
Theoretical Damage of MP5 when it is a headshot = 102 x 189 x 115% = 22,169.7
Note:
Bullets lose damage over time due to loss of bullet speed over time. This is particularly noticeable when you try to compare the damage in the Socom theoretically and practically (assuming all shots hit the torso). Theoretically, 5 shots is enough to kill, but in practice, it is 6 shots. Similarly, for the Ruger, in theory (assuming all shots hit the torso), it kills in 2 shots. In practice, it kills in 2 shots at close-mid range, but 3 shots at long range.