M16 6.8 SPC Grendel Enhanced Bolt Carrier Group with Buffer Technology

Black Rifle Arms^® M16/AR15 Enhanced 6.8 SPC Bolt Carrier Group Patented Buffer Technology

We Set Out To Improve Upon Existing Bolt Carriers

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The enhanced carrier's integrated buffer helps not only to eliminate metal on metal contact during the transition from upper to lower receivers, but it also buffers the impact between carrier and buffer. Comes with standard bolt carrier polymer buffer.

BOLT CARRIER:

• BCG Weight: 10.76 oz.
• Bolt Carrier Material, 8620
• Key Material, 4130
• Bolt Carrier EXO Nickel Boron Coating by UTC Coatings
• Standard Firing Pin
• Bolt body produced from AISI 9310 VAR (Vacuum Arc Remelt), the highest standard bolt material made
• Machined completely in one operation; this eliminates tolerance and repeatability issues that arise from the multiple fixturing processes used by other manufacturers
• Enhanced Design for utmost reliability
• Tightly controlled proprietary heat treat process to accurately control cast depth and core hardness
• Extractor produced from MIL-S-5000 steel and vacuum hardened
• NSCW Crane Division extractor upgraded with Viton® o-ring, 5 coil spring, and plunger
• Cam Pin, Melonite QPQ
• Firing Pin Retaining Pin 
• Standard Size Integrated Polymer Buffer:
• Eliminates metal on metal contact
• Eliminates contact between the hardened steel carrier, aluminum receiver extension and buffer
• Eliminates hardened steel carrier as it transitions between upper and lower receivers
• Self-lubricating, shock-absorbing and has seven times the abrasion resistance of carbon steel
• Reduction in felt recoil and vibration