Note from the manufacturer:
*All AR uppers are test fired with a Mill Spec Lower before the item ships. Any "aftermarket" triggers may or may not create an issue that we have no control over. Additionally, this upper is NOT compatible with notched AR-15 hammers.
- Upper Receiver Type: A4 Style Flat-Top
- Barrel Length: 16"
- Barrel Contour: Not listed by manufacturer
- Barrel Material: Chrome Moly Steel
- Muzzle Thread Pattern: Not listed by manufacturer
- Chrome Lined: Yes
- Barrel Finish: Black Matte
- Twist Rate: 1 in 16"
- Chamber: 22 Long Rifle
- M4 Feed Ramps: No
- Muzzle Device: A1 Flash Hider
- Gas System Length: None, Blowback
- Gas Block Diameter: .750"
- Handguard: M4 Polymer Handguards
- Sights: A2 Front Sight
- Bolt Carrier Assembly Included: Yes
- Bolt Carrier Type: 22 LR Compatible Carrier
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.