HK MR556A1 Complete Upper Receiver Kit 5.56 NATO Black AR-Style Upper Receiver
Specifications
Action Double Action
Finish Black
Optic Ready Yes
Barrel Length 16 inches
Caliber / Gauge 5.56 NATO
Threaded Barrel Yes
WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to WWW.P65WARNINGS.CA.GOV
Description
Product Overview
Build an AR-15 style rifle configuration using the HK MR556A1 Complete Upper Receiver Kit. This complete upper receiver/barrel assembly includes the MR556A1 upper receiver with a 16-inch 4140 steel barrel, a complete bolt mechanism, and the buffer and action (recoil) spring for reliable semi-automatic operation. It is intended for use with Mil-Std buffer tubes and is manufactured to HK specifications for proper fit and function as a complete kit.
Key Features
- Includes MR556A1 upper receiver/barrel assembly, complete bolt mechanism, and recoil spring
- Standard AR muzzle threading for accessory compatibility
- 16-inch 4140 steel barrel chambered for 5.56 NATO / .223 Rem
- Gas-operated AR-style semi-automatic cycling designed for compatible Mil-Std buffer tubes
- Picatinny top rail for mounting an optic
Choose this HK MR556A1 upper kit to standardize parts fitment and keep your build aligned with HK URK specifications.
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- SKU:
- 235975A5
- UPC:
- 642230247048
- BUDS ID:
- 82558
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Retail Availability
Bud's Gun Shop - Lexington, KY
1105 Industry Road, Lexington, KY 40505
Bud's Gun Shop - Sevierville, TN
2270 Two Rivers Blvd, Sevierville, TN 37876
Uncle Lee's - Greenville, KY
820 Main St, Greenville, KY 42345
