5.56mm

5.56mm is an ammo type in Fallout 3 and Fallout Tactics.

Generally speaking, In Fallout 3, 5.56mm is second most common small guns ammunition found in the game, behind 10mm. After Picking up the Trail it becomes much more available as enemies start carrying Assault Rifles in place of Hunting Rifles.

Weapons using 5.56mm ammunition

 * Assault Rifle
 * Chinese Assault Rifle
 * M16A1
 * Ruger AC556F