One Horse M16 5.56x45mm NATO/.223 Remington/.300 Blackout Bolt Carrier Group Nitride Black. Designed for seamless compatibility with 5.56 NATO and .300 Blackout this BCG ensures flawless cycling and extraction in any build. Every component is treated with a premium nickel boron finish for exceptional corrosion resistance ultra-low friction and effortless cleaning delivering smoother operation than standard coatings. Built to exacting Mil-Spec standards its the ultimate choice for reliability and performance. Precision-machined 9310 steel bolt and 8620 steel carrier fully nickel boron coated Compatible with 5.56/.223 and .300 Blackout barrels for versatile performance Full nickel boron finish for superior lubricity and wear resistance Mil-Spec construction with staked gas key and shot-peened bolt for rugged reliability Specifications for One Horse M16 5.56x45mm NATO/.223 Remington/.300 Blackout Bolt Carrier Group: Manufacturer: One Horse Carrier Material: 8620 Steel Bolt Material: 9310 Steel Caliber: 5.56x45mm NATO .300 AAC Blackout .223 Remington Gun Model: M16 Package Contents: One Horse M16 5.56x45mm NATO/.223 Remington/.300 Blackout Bolt Carrier Group What firearm models does the manufacturer say One Horse M16 5.56x45mm NATO/.223 Remington/.300 Blackout Bolt Carrier Group is compatible with? The manufacturer suggests that One Horse M16 5.56x45mm NATO/.223 Remington/.300 Blackout Bolt Carrier Group is compatible with M16One Horse OH-UBC01: M16 5.56x45mm NATO/.223 Remington/.300 Blackout Bolt Carrier Group Nitride Black