Bullet penetration is one of the most complex characteristics and perks in Call of Duty 4. Bullet penetration damage is basically how much damage a bullet from your gun will do after it passes through another surface. To determine this damage value you have to consider both the damage penetration abilities of your gun and the bullet stopping abilities of the surface you are shooting through. For surfaces you basically have 4 levels of stopping ability, tiny, small, medium and large. For gun penetration values you can check out our Weapon Stats Chart. To add another twist the Deep Impact perk increases the bullet penetration of weapons. Lots of information I know, but if we put all together we can make the bullet penetration chart below. Read more