Complete your bolt carrier group with the upgraded LifeCoat VDI parts. - This kit includes LifeCoat: - 5.56 Bolt - Cam Pin - Firing Pin - Cotter Pin - LifeCoat is more than just an application or coating processes. It is the most technologically advanced coating processes material and machining available on the market today. LifeCoat is the idea that certain processes and materials are superior for their applicable needs and when combined they offer efficiencies unparalleled to anything currently available. - There are numerous amounts of coating process available on the market today claiming to be the best; some are baths that can do blind holes while others are strictly line of sight applications. Some of these coatings have little to no tolerance buildup and are considered molecular/permeated processes. Some coatings are best for lubricity while others fill the need for surface hardness or corrosion resistance. This isn