- Upper Receiver: A3 Flat-Top
- Barrel Length: 16"
- Barrel Contour: M4 Government
- Barrel Material: Hammer Forged CMV
- Muzzle Thread Pattern: 1/2"-28
- Chrome Lined: Yes (FNH Double Chrome Lined)
- Twist Rate: 1 in 7"
- Chamber: 5.56x45mm NATO chamber
- Muzzle Device: A2 Flash Hider
- Gas System Length: Carbine
- Gas Block Diameter: 0.750"
- Handguard: GlacierGuard
- Sights: A2 Front Sight Base attached with Taper Pins
- Bolt Carrier Assembly Included: Yes (8620 Steel Carrier Assembly)
- Bolt Carrier Type: Mil-Spec Bolt Carrier, Phosphate Coated with Chrome-lined interior
Please Note: Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.
Additional Information: The Extreme Duty Upper utilizes a Cold Hammer Forged Barrel made by FNH but since they are made specifically for Del-Ton, there is no FNH stamp found on the barrel. Customers can verify their barrel is an FNH barrel by looking for a stamp that says "MP" meaning Magnetic Particle Inspection.