The AB Arms Mission Critical Kit is a collection of critical replacement parts for you and your AR-15/M-4 that are there to serve you in your time of need. The MCK is manufactured for military and law enforcement, as well as civilian firearms enthusiasts. The MCK will make sure you have what you need, when you need it.

• Complete nickel boron coated bolt assembly
• AB Arm firing pin and firing pin retaining pin
• AB Arms extractor and extractor axle
• Six AR-15 gas rings
• 5.56 Broken shell extractor
• 2 vials of 3ml breakthrough battle born high-purity oil
• Tactical black, ballistic nylon case with multiple gear pockets along with a variety of other critical accessories