The ToolCraft Bolt Carrier Group is the “Heart of an AR-15.” The bolt carrier houses the bolt and resets the hammer as it moves within the upper receiver. The carrier also bears the brunt of the gas pressure during operation. This pressure moves it back to cycle the firing mechanism, and its performance is crucial to the proper function of your firearm.
In addition to having an attractive chrome colored finish, the Nickel/Boron finished BCG has a low co-efficient of friction and is wear resistant. Due to the columnar structure of the Nickel/Boron, the ToolCraft NiBor BCG is naturally lubricious and hard (70C+, on Rockwell scale).
The ToolCraft Nickel Boron BCG is an M16 Full Auto (Preferred for most AR-15 builds)
- 5.56 / .223 caliber
- Bolt Carrier constructed from 8620 steel
- Bolt constructed from 9310 steel
- Gas Key constructed from 4130 Steel; Grade 8 Gas Key Screws
- Mil-Spec O-Ring
- Mil-Spec gas rings (3)
- MPI inspected
- Weighs 11.7oz
- Made in the USA
- Includes Lifetime Warranty from ToolCraft