If your shot hits an enemy after piercing an enemy, it causes massive bonus damage. The first shot fired from a fully loaded magazine causes bonus damage. Improves your accuracy with all gun types. Killing an enemy gives you bonus critical hit damage and reload speed for a few seconds
Also, your aim is not disrupted as much when taking damage. Be careful though, because as soon as you miss, you lose that bonus damage and have to start over. In other words, if you continuously get critical hits, your shots will eventually become a 1-hit kill, even on enemies at a higher level than you. Each critical hit landed boosts the power of the next critical hit, forever. Critical Ascensi0n is the treat skill here. Because cloaking isn't helpful from far away, the B0re skill highlights critical hit spots on enemies to help you deal huge amounts of damage whilst sniping.
This tree focuses on guns, Sniper Rifles especially.