5.56mm round

The 5.56mm Round is a type of small guns ammunition found in Fallout 3 and Fallout Tactics.

Fallout 3
Generally speaking, the 5.56mm Round is the third most common small guns ammunition found in the game, behind .32 Caliber Round and 10mm Round. 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
 * Xuanlong Assault Rifle

Fallout Tactics
Weapons using 5.56mm ammunition:
 * M16A1
 * Ruger AC556F