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Joe, this upper has a "Rifle" Length Gas System.

Joe, this upper has a "Rifle" Length Gas System. ----------------- (Specifications): - Upper Receiver Type: A3 Flat-Top - Barrel Length: 20" - Barrel Contour: Not listed by manufacturer - Barrel Material: Chrome Moly Steel - Muzzle Thread Pattern: 11/16"-24 - Chrome Lined: Yes - Barrel Finish: Black Matte - Twist Rate: 1 in 24" - Chamber: 450 Bushmaster - M4 Feed Ramps: Not listed by manufacturer - Muzzle Device: Izzy Muzzle Brake - Gas System Length: Rifle - Gas Block Diameter: Not listed by manufacturer - Handguard: Free Float - Sights: None - Bolt Carrier Assembly Included: Yes - Bolt Carrier Type: N/A - Includes 5-round magazine.