Spikes Tactical BCG .308 - Phosphate Finish. 308 Bolt Carrier Group BCG available with a phosphate or nickel boron finish. Thee Bolt Carrier Groups brought to you by Spikes Tactical feature an 8620 tool steel carrier gas key and extractor as well as a 9310 tool steel bolt for tough composition you can depend on with every shot. This Spikes Tactical .308 DPMS Style Bolt Carrier Group BCG includes a carrier and gas key with chrome interiors that will hold up in tough circumstances even after years of use. Trust the tough construction and precision-machined components of this Spikes Tactical .308 BCG. Specifications for Spikes Tactical .308 Bolt Carrier Group (BCG): Manufacturer: Spikes Tactical Fabric/Material: 8620 Tool Steel Carrier Material: 8620 Steel Bolt Material: 9310 Steel Caliber: .308 Winchester Condition: New Projectile Caliber: .308 Caliber Country of Origin: USA Features of Spikes Tactical .308 Bolt Carrier Group BCG: Laser Engraved w/ ST Spider Logo DPMS Style Carrier: 8620 Tool Steel Full Auto Chrome Inside Bolt: 9310 Tool Steel Shot Peened Extractor: 8620 Tool Steel Extractor Spring Phosphate Finish Gas Key: 8620 Tool Steel Grade 8 Hardware Properly Staked Chrome Interior Firing Pin with Hard Chrome Finish Cam Pin Phosphate Finish Retaining Pin Package Contents: Spikes Tactical .308 Bolt Carrier Group Spikes Tactical STXBG01: BCG .308 - Phosphate Finish