HK MR556 AR-15 Flat-Top Gas Piston Upper Assembly 5.56x45mm NATO 1 in 7" Twist 16.5" Barrel Chrome Moly Matte with Quad Rail Free Float Handguard, Flash Hider
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- Upper Receiver: MR556 Flat-Top
- Barrel Length: 16.5"
- Barrel Contour: Heavy
- Barrel Material: Hammer Forged Chrome Moly Steel
- Muzzle Thread Pattern: 1/2"-28
- Chrome Lined: No
- Barrel Finish: Parkerized
- Twist Rate: 1 in 7"
- Chamber: 5.56x45mm NATO
- M4 Feed Ramps: Yes
- Muzzle Device: A2 flash hider
- Gas System Length: Carbine, short stroke gas piston
- Gas Block Diameter: 0.750"
- Handguard: 9" Free Float Quad Rail
- Sights: None
- Extras: Carbine buffer spring and tungsten filled heavy buffer
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.
Shipping Weight: 13.800 PoundsXThe total weight of the product, including the product’s packaging as it sits on our shelf. Since some products ship directly from the Manufacturer, their weight may be unavailable. Because of variations in the manufacturing process, similar products may have differing weights. Unless the product is designated as “Ships Alone”, Shipping Weight does not include the shipping box or packing materials associated with your order.
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