Spike's Tactical 5.56/.223 M16 Cut Nickel Boron Bolt Carrier Group - ST5BG03

Your bolt carrier group is one of the most critical parts of your build. Don’t buy an imitation. Spike’s Tactical AR-15/M16 Nickel Boron Bolt Carrier Group. These complete bolt carrier groups come magnetic particle inspected and high pressure tested. The carrier is made from 8620 steel and the bolt from 9310 tool steel. The gas key is properly staked, the extractor spring has been upgraded with an O-ring for increased tension, and all surfaces are coated with nickel boron. Nickel boron is much easier to clean and can help your firearm run more reliably when heavily fouled or with little lubrication. The Spike’s Tactical Spider Logo is engraved on the right side of the carrier to show through the ejection port. Assembled BCG weighs 11.6 oz.

Includes:

• Firing pin with hard chrome finish.
• Cam pin with nickel boron finish.
• Retaining pin.

Bolt carrier:

• 8620 tool steel.
• Full Auto/M16 cut.

Bolt:

• 9310 tool steel.
• Shot peened.
• High pressure tested.
• Magnetic particle inspected.

Extractor:

• 8620 tool steel.
• Nickel boron finish.
• Extractor spring.
• Black extractor insert.
• Viton O-Ring.

Gas key:

• 8620 tool steel.
• Grade 8 hardware.
• Properly staked.