The effects of Enforcer are calculated per-pellet from a shotgun blast and not by single round fired. The pellets will only cripple the limbs they hit, so hitting the same limb is pointless for crippling, but will still calculate stagger. Range also has no bearing on stagger or cripple chances, just hitting is all that is needed. Multiple limbs can be crippled at the same time, and from multiple enemies too.
|1||Your shotguns gain a +5% stagger chance and a 10% chance to cripple a limb||00322354|
|2||Your shotguns gain a +10% stagger chance and a 20% chance to cripple a limb||00322355|
|3||Your shotguns gain a +15% stagger chance and a 30% chance to cripple a limb||00322356|