You know how to get the full damage out of a weapon type your class doesn’t normally use.
Prerequisites: Character level 3rd, proficiency with selected weapon type.
Benefit: Choose one weapon type (_small arms_, _longarms_, _heavy weapons_, etc.). You gain specialization in that weapon type, which means you add your character level to damage with the selected weapon type, or half your character level for _small arms_ or _operative melee weapons_. You can never have specialization in _grenades_.