H&K Heckler & Koch

H&K HK MR556/MR223 A5 Incomplete Upper Receiver - Black

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SKU:
HKP-18785
MPN:
50237608
  • H&K HK MR556/MR223 A5 Incomplete Upper Receiver - Black
  • H&K HK MR556/MR223 A5 Incomplete Upper Receiver - Black
  • H&K HK MR556/MR223 A5 Incomplete Upper Receiver - Black
  • H&K HK MR556/MR223 A5 Incomplete Upper Receiver - Black
  • H&K HK MR556/MR223 A5 Incomplete Upper Receiver - Black
$0.00

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.*** 

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Additional Information

Age Group:
Adult
Expiration Date:
43595
Origine:
German
Firearm Model:
HK MR556
Firearm Model:
HK MR223
Caliber:
5.56 / .223
Color:
Black
Material:
Aluminum
MPN:
50237608
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1 Review

  • 4

    I bought the A5 upper in black about a year ago now, and noticed that the thread pitch was different...

    Posted by Mark Dickinson on 8th Feb 2020

    I bought the A5 upper in black about a year ago now, and noticed that the thread pitch was different. HK re-worked how the barrel attached to the receiver. You can tell in these pictures here for this "MR 556 upper" how there is now a metal nub that actually sticks out to mate with a slot in the new A5 barrel assemblies, instead of the older style with a separate little pin that can come in a narrow or wide size. Also, the barrel nuts have changed to match the finer thread pitch that this upper has. Just be aware before you buy this that while this part is of magnificent quality, with a fine finish, and definite upgrades from the old design, I have still not yet been able to source the newer 416 A5 barrel assemblies, so you wont be using this anytime soon, unless you take it to a gunsmith and have the threads reworked.

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