When hit to head - helmet area with low caliber, you get stunned - fall on ground, vomit, blurred vision for some time.
When hit to head - helmet area with high caliber, you die.
When hit to head - face area with any caliber, you die.
When hit to arm - you can only use one pistol, knife or grenade.
When hit to leg - you will be 30% slower and cant sprint.
When hit to both legs - you can only crawl.
When hit to chest with heavy bulletproof vest on, you will be shaking your aim for some time.