Upper Receiver

• Receiver Machined from Aluminum Forgings 7075-T6 and Hardcoat Anodized per MIL-A-8625F, Type III, Class 2
• M4 Feed Ramp Flat Top with Laser T-markings
• Mid Length Gas System

BCM Bolt Carrier Group

• Machined from MIL-SPEC Carpenter No. 158® Steel
• HPT/MPI (High Pressure Tested/Proof) · (Magnetic Particle Inspected)
• Shot Peened
• Tool Steel Extractor w/ BCM® Extractor Spring
• Black Extractor Insert
• Chrome Lined Carrier (Full Auto Profile)
• Chrome Lined Gas Key Hardened to USGI Specifications, w/ Staked Grade 8 Fasteners per MIL-SPEC

BCM Lower Receiver

• Receiver Machined from Aluminum Forgings 7075-T6, Hardcoat Anodized (per MIL-A-8625F, Type III, Class 2)
• Low Shelf for RDIAS Installation - Installation of a registered drop-in auto sear allows weapon to fire on full automatic
• Low Shelf for Accuwedge use
• Fire Controls Marked SAFE and SEMI
• BCM® Milspec 7075-T6 Receiver Extension
• Staked M4 Lock Nut
• USGI H Buffer (1 USGI Tungsten, 2 Steel)

BCM Barrel

• Independently Certified MIL-SPEC 11595E Barrel Steel, Manganese Phosphate Barrel Finish on Entire Barrel
• 16" Standard Government Profile Barrel 1/7 Twist, M4 Feed Ramp Extension
• USGI 5.56mm NATO Chrome Lined Bore and Chamber
• HPT/MPI(High Pressure Test) (Magnetic Particle Inspected), per MIL-SPEC