The Mission Critical Kit from American Built Arms is a collection of critical parts for the AR-15 or M-4. It is designed to provide everything you are liable to need in the event of a rifle failure. Manufactured for the military and law enforcement, as well as civilian firearm enthusiasts, the Mission Critical Kit is packed in a tactical black ballistic nylon case with multiple pockets.

Includes:
Complete nickel boron bolt assembly
Chrome plated firing pin
Firing pin retaining pin
Extractor
Extractor axle
6 Gas rings
Bolt assembly card
2 black gear bands
Latex barrel colver
5.56 broken shell extractor
Two 3ml vials Breakthrough Battle Born High Purity Oil
2 latex free adhesive bandages and alcohol prop pad
5" x 3.5" x 1" ballistic nylon case with multiple gear pockets