FailZero AR15 Bolt Carrier Group BCG No Hammer Black. The majority of components in these FailZero Bolt Carrier Groups are nickel boron-treated to create a stronger part that is resistant to corrosion and has permanent dry lubricity . The FailZero AR15 5.56/.223 Bolt Carrier Group BCG No Hammer comes fully-assembled so that you can easily install it without worry. Upgrade to the FailZero AR15 Semi-Auto BCG No Hammer to improve your weapon's function with a rugged reliable Bolt Carrier Group BCG. Specifications for FailZero AR15 Bolt Carrier Group (BCG) No Hammer: Manufacturer: FailZero Finish: Nickel Boron Fabric/Material: Steel Carrier Material: 8620 Steel Bolt Material: Steel Gun Make: AR Platform Gun Model: AR-15 Condition: New Features of FailZero AR15 Bolt Carrier Group BCG No Hammer: Comes fully assembled and ready to drop into most mil-spec AR15 upper receivers All critical parts are coated with Nickel Boron technology that provides permanent dry lubricity extreme durability and increases both wear and corrosion resistance. Our patented Nickel Boron coating will reduce friction and improve the overall performance of your rifle. Package Contents: FailZero AR15 Bolt Carrier Group No Hammer What firearm models does the manufacturer say FailZero AR15 Bolt Carrier Group (BCG) No Hammer is compatible with? The manufacturer suggests that FailZero AR15 Bolt Carrier Group (BCG) No Hammer is compatible with AR-15FailZero FZ-AR15-01-NH-BLACK: AR15 Bolt Carrier Group No Hammer Black