Description
HK Heckler and Koch A4 Complete Upper with Full Auto Ejection Door for HK MR556
The HK MR556 A4 Complete Upper is a superior factory assembly that comes fully equipped with a forward assist and an ejection port door, providing unparalleled reliability and precision. This upper is the ultimate choice for enhancing your rifle or launching a premium build. With compatibility for all A5 style barrels, including those from Nefarious Arms, you can trust that this upper will elevate your build to the next level.
Features:
- OEM HK MR556 A4 complete upper assembly
- Includes forward assist and ejection port door
Compatible With:
- MR556 A4, A5
- Compatible with most AR-15 lowers*
*Minor fitting may be required for non-HK lowers.
