HK MR556 HKey Forearm Upper Kit
New HK Factory German MR556 Upper Kit With Key Mod Rail
Only a few available latest HK production.
HK MR556 Upper kit includes:
- Complete MR556 upper receiver with HKey forearm and 2 rail segments
- MR556 Bolt group Complete
- Tungsten Filled HK Buffer
- HK Buffer Spring
- One 30 Round HK Steel Maritime Magazine
This unit will drop on any mil-spec AR-15 lower receiver.
No FFL required as the upper assembly is only considered a part and not an FFL item. This is a rare offering and extremely hard to find new.
- Condition: New
- Origin: German
- Brand: Heckler & Koch
- Caliber: 5.56 x 45mm / .223
Out of stock