HK AR-15 MR556 Flat-Top Gas Piston Upper Receiver Assembly 5.56x45mm NATO
- 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.
Ships Alone: NoXProduct ships from MidwayUSA, separate from any other products on your order due to its size. Products that are Shipped Alone incur separate "Per Order" and "Per Pound" shipping charges.
DOT-Regulated: NoXProduct is regulated by the US Department of Transportation (DOT) and cannot be shipped via USPS or air shipping methods. DOT-Regulated products must ship UPS Ground.
Carrier Restrictions: NoXProduct is restricted by shipping carriers and cannot be shipped to certain locations or via certain shipping methods.
HazMat Product: NoXAdditional shipping charge for HazMat products. Carriers charge extra to ship packages with products they consider hazardous, such as reloading powder and primers.
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