Faxon Firearms Duty Series AR-15 7.62x39 16in Upper Receiver Gunner Mid Length 1-8 Twist 5/8x24 w/BCG Supressor Black. 62x39 barrel combines AK-caliber power with AR-15 precision. Designed for balance and control the Gunner profile merges the strength of a Government contour with the light weight and maneuverability of a Pencil profile. Machined from 4150 CMV steel and finished with a salt bath Nitride treatment inside and out this barrel offers durability corrosion resistance and consistent accuracy. Each Faxon barrel is stress relieved air-gauge tested and features an 11-degree target crown for precision shot placement. Specifications for Faxon Firearms Duty Series AR-15 7.62x39 16in Upper Receiver: Manufacturer: Faxon Firearms Caliber: 7.62x39mm Overall Length: 25.25 in Barrel Length: 16 in Barrel Profile: Gunner Barrel Twist Rate: 1-8 Firearms Threads Per Inch: 5/8x24 Color: Black Gun Model: AR-15 Fabric/Material: Stainless Steel Handguard Length: 15 in Gun Make: AR Platform Flutes: No Package Contents: Faxon Firearms Duty Series AR-15 7.62x39 16in Upper Receiver What firearm models does the manufacturer say Faxon Firearms Duty Series AR-15 7.62x39 16in Upper Receiver is compatible with? The manufacturer suggests that Faxon Firearms Duty Series AR-15 7.62x39 16in Upper Receiver is compatible with AR-15Faxon Firearms FX-URG-D76216GA15-C-SR: Duty Series AR-15 7.62x39 16in Upper Receiver Gunner Mid Length 1-8 Twist 5/8x24 w/BCG Supressor Black