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: Aluminum
- Muzzle Thread Pattern: 1/2"-28
- Chrome Lined: No
- Barrel Finish: Black Matte
- Twist Rate: 1 in 16"
- Chamber: 22 Long Rifle
- M4 Feed Ramps: No
- Muzzle Device: None
- Gas System Length: None-Blowback
- Gas Block Diameter: N/A
- Handguard: Hogue Free Float
- Sights: None
- Bolt Carrier Assembly Included: Yes
- Bolt Carrier Type: 22 LR Compatible Carrier