Phase 5 Weapon Systems Bolt Carrier Group – AR-15

The Phase 5 Weapon Systems Bolt Carrier Group is a direct replacement for standard AR-15 mil-spec BCGs, designed for shooters who want a proven alternative to factory components. This BCG handles the core cycling functions—extraction, ejection, chambering, and firing—with machining tolerances that meet mil-spec standards. It's a solid choice for builds, repairs, or as a spare for high-volume shooters.

Machined from 8620 steel with a manganese phosphate finish, this bolt carrier group delivers wear resistance and corrosion protection comparable to military-issue parts. The gas key is properly staked and sealed. Installation is straightforward drop-in for anyone familiar with AR-15 field stripping. No fitting or modification required.

• Part Type: Bolt Carrier Group
• Compatible Firearms: AR-15 / M16 (5.56 NATO / .223 Rem)
• Material: 8620 Steel
• Finish: Manganese Phosphate (Parkerized)
• Installation: Drop-In
• Includes: Bolt Carrier, Bolt, Cam Pin, Firing Pin, Retaining Pin