MR556 Upper Receiver With F/A & Ejection Door
New HK German Partially Pre-assembled MR556 Upper Receiver
Each unit comes just as shown with the forward assist assembly and ejection port door assembly installed from the HK factory. As it came from the factory at HK. Rare & hard to find.
- HK 416
- Clone builds
- Origin: German
- Brand: Heckler & Koch