FailZero 9.2 oz Total BCG Weight Lightweight/Low Mass Bolt Carrier Group BCG No Hammer EXO. These Bolt Carrier Groups developed by FailZero offer a 21percent weight reduction compared to a standard Mil-Spec carrier. All components of the FailZero FZ Lightweight Low Mass Bolt Carrier Group BCG are EXO nickel boron coated to prevent wear and create an easier cleaning experience. With a lighter weight you can take quicker follow-up shots and gain better control of your groupings. Reduce felt recoil while greatly improving your overall performance in the field by adding this FailZero FZ Lightweight BCG to your weapon build. Specifications for FailZero FZ Lightweight Bolt Carrier Group (BCG): Manufacturer: FailZero Color: Silver Finish: EXO Nickel Boron Carrier Material: 8620 Steel Bolt Material: Steel Caliber: 5.56x45mm NATO .300 AAC Blackout .223 Remington Gun Make: AR Platform Gun Model: M16 AR-15 Weight: 9.2 oz Condition: New Features of Failzero FZ Lightweight Bolt Carrier Group BCG 21percent weight reduction from standard Mil-Spec carrier FZ logo engraved into the carrier New high polish finish on all components Package Contents: FailZero FZ Lightweight Bolt Carrier Group Bolt and Extractor Lightweight Bolt Carrier Extractor Cam Pin Carrier Key Firing Pin What firearm models does the manufacturer say FailZero FZ Lightweight Bolt Carrier Group (BCG) is compatible with? The manufacturer suggests that FailZero FZ Lightweight Bolt Carrier Group (BCG) is compatible with AR-15 M16FailZero FZ-LW-BCG-01-NH: 9.2 oz Total BCG Weight Lightweight/Low Mass bolt Carrier Group No Hammer EXO