FailZero is the arms product brand for UCT Coatings, Inc. FailZero offers EXO Nickel Boron coated Bolt Carrier Groups as complete "drop-in kits" for semi-auto AR15s and full-auto M16/4s. Note: Our full-auto carriers run great in ARs too! These tactical upgrades give law enforcement, security and military professionals the "active weapon advantage" in critical use: no grease to hold grit, no oil to wear off, no gun-jamming crud on key components. FailZero Bolt Carrier Groups use patented EXO Technology to provide permanent dry lubricity to metal surfaces. This breakthrough technology, thoroughly proven in SWAT applications, DoD testing and battlefield conditions, creates a greaseless, permanently lubricious surface that's harder than the substrate itself. Unlike films, conventional coatings and applied lubricants, it never rubs off, thins out, spalls off, or builds up crud. EXO coated bolt carrier group components reduce maintenance and improve the performance of tactical firearms such as AR-15 and M16/4 rifles.