Barrier Armor Rating
A unit's Barrier Armor Rating (or BAR) is a statistic used to indicate how hardy a unit is on the battlefield. This statistic is only used by civilian or industrial units that have been pressed into service by a military force. Combat units like BattleMechs, tanks, and AeroSpace Fighters do not use a BAR because they've been contructed specifically for combat. Support units and civilian vehicles pressed into military service however, are typically not as well armored as their combat-oriented counterparts. The "armor" used by civilian and support vehicles is designed to protect them from everyday wear and tear rather than incoming missiles. The BAR provides a means to reflect the increased fragility of non-combat units in a combat area.
Basically any unit hit by a weapon that inflicts more damage than its BAR will need to check for a critical hit, even if the weapon didn't damage internal structure.[1] So a Silverfin coastal cutter (BAR 7) hit by a PPC blast will have to check to see if it sustains a critical hit as the artificial lightning leaks through a small gap in the armor plating.
IndustrialMech Armor
Introduced 2439 in the Terran Hegemony[2]. Like their military cousins, IndustrialMechs mount armor in sheets weighing a full ton or half ton. Unlike BattleMechs, IndustrialMechs are not usually designed for combat, and therefore have a Barrier Armor Rating. IndustrialMechs can only mount a few armor types, none of them advanced.[3]
- Heavy Industrial armor is functionally the same as BattleMech armor, witha stated BAR of 10.
- Industrial armor also has a BAR of 10, but only offers 67% the protection of Heavy Industrial armor.
- Commercial armor offers 50% more protection per ton of weight, but only has a BAR of 5.
Support Vehicle Armor
Due to the wide variety of vehicle chassis, armor types, and industrial capacity, support vehicles have a variable BAR that depends on the designer's choices.[4]