Concentrated Fire

Concentrated Fire is a Fallout 3 and a Fallout: New Vegas Perk.

Description
With Concentrated Fire, your accuracy to hit any body part in V.A.T.S. increases slightly with each subsequent hit on that body part. Every time you target the same body part in VATS, your chance-to-hit raises by +5%. So, if your first to-hit was 40%, 2nd would be 45%, 50%, etc. This can lead to very easy head-shots when teamed with other to-hit % boosters (Sniper, Commando, etc).