The 5.56 receiver is a weapon mod for the Crusader pistol introduced in the Fallout 76 update Steel Dawn.
Effects[]
Applying this mod to the Crusader pistol changes the ammo type from the common 10mm round to the rarer 5.56 round, resulting in 16% increased damage.
Crafting[]
Location[]
Craftable at any weapons workbench after having learned the plan.