Lantac Enhanced Full Auto Style Bolt Carrier Group BCG w/ NiB Coating .223/5.56x45mm. Precision machined from high quality 8620 steel and coated with NiB electroless nickel boron with advanced UCT EXO these Bolt Carrier Groups by LANTAC offer ultimate lubricity for a smoother operation. The Lantac Full Auto 8620 Bolt Carrier Group BCG has a unique shape with forward porting that allows the upper receiver to run with less pressurization and runs cooler and cleaner with a flatter energy pulse. Your rifle deserves the best bolt carrier so choose the Lantac Enhanced NiB BCG Specifications for Lantac Enhanced Full Auto Style Bolt Carrier Group (BCG) w/ NiB Coating: Manufacturer: LANTAC Color: Steel Finish: NIB Carrier Material: 8620 Steel Bolt Material: 9310 Steel Condition: New Features of Lantac Enhanced Full Auto Style Bolt Carrier Group BCG w/ NiB Coating: Weight 1Lb 2.1oz DPMS Pattern Full Auto & Semi-Auto Compatible Forward Porting Enlarged Vents. Balanced flared boss. 8620 Carrier Heat Treated Hard Turned. 9310 Bolt Hard Turned / Ground. NiB UCT EXO Coating. CP-R360-H Domed Cam Pin Mil-Spec Gas Rings Mil-Spec Staked Gas Key Grade 8 Hardened Fasteners All Hard Chrome surfaces are to MIL-STD-171 1.2.2.2 Lifetime Warranty. Package Contents: Lantac Enhanced Full Auto Style Bolt Carrier Group w/ NiB Coating 2D0-BCG-FASB Lantac LA00223: Enhanced Full Auto Style Bolt Carrier Group w/ NiB Coating .223/5.56x45mm