Phase 5's Mil-spec AR-15 bolt carrier features a heat treated and chrome lined inner with a black phosphate coating. The complete bolt carrier group includes cam pin, firing pin, gas key, and bolt.
Specifications:

Type	Bolt Carrier Group
Model	AR-15
Dimensions	7.5" L
Size
Material	Heat-Treated Stainless Steel
Action
Trigger
Safety
Thread Pattern
Finish	Black Phosphate
Bolt Type
Hand
Hammer Type
Max Capacity