HK AR-15 MR556 Gas Piston Upper Receiver Assembly 5.56x45mm NATO 16.5" Barrel
HK now offers the long awaited civilian variant of the popular 416 upper. This MR556, match grade upper receiver assembly comes complete and ready to pin onto any standard AR-15 lower receiver. The short stroke gas piston design ensures cooler, cleaner operation of this upper for reliabilty and less time scrubbing residue out of the receiver after extended shooting sessions. The flat-top upper receiver and free floating KeyMod rail upper allow plenty of room for mounting sighting devices and any other popular KeyMod accessories the operator chooses. Upper receiver assembly also ships with a carbine length buffer spring and heavy, tungsten filled buffer.
- 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 KeyMod Compatible
- Sights: None
- Bolt Carrier Assembly Included: Yes
- Bolt Carrier Type: Mil-Spec
- 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.
- The 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. Shipping Weight: 129 Pounds
- Product 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. Ships Alone: Yes
- Product 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. DOT-Regulated: No
- Product is restricted by shipping carriers and cannot be shipped to certain locations or via certain shipping methods. Carrier Restrictions: No
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