Description
HK German Un-Assembled/Stripped HK MR556/MR223 A5 Upper Receiver
Factory HK MR556 A5 upper receiver. This is the semi-auto MR556 variant.
Compatible With:
- HK MR556
- HK MR223
- HK 416***
Need a matching lower for your build? STS416 A5 LOWER – Specialized Tactical Systems
***Although this MR556 receiver is compatible with 416 lowers, the 416 bolt carrier group is not compatible with the MR556 upper receiver without modification to the upper receiver. To pair this MR556 upper to a 416 lower without modification to the MR556 upper receiver, use the MR556 semi-auto bolt carrier group.***
