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HK 51000385 UPPER RECEIVER KIT MR556A4 11"

HK 51000385 UPPER RECEIVER KIT MR556A4 11
HK 51000385 UPPER RECEIVER KIT MR556A4 11
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HK 51000385 UPPER RECEIVER KIT MR556A4 11

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Questions & Answers
can a Geissele Super Dynamic trigger be compatible with this upper?

Geissele made a trigger specifically for the HK416 / MR556A1 and if I had to guess, that trigger would be fully compatible with the A4 lower receiver. But no, the other triggers will not work. That's why one was made specifically for the MR rifles, big & small caliber

by Keithy baby, Verified Owner, February 17, 2026
Does this come with the HK case? What is included in the kit, specifically? Can you answer this question?
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Customer Reviews
Helpful Positive Review
HK is the way by HK Poor, Verified Owner, May 19, 2026
This upper exudes quality. It runs great suppressed. Comes in a nice soft case with the buffer and spring. I got a great deal on it from Optics Planet too!
1/1 found this helpful
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Code: 13-UFH-51000385-EDEMO-RE-C

MPN: 51000385-EDEMO

Product No Longer Available

Product Info for HK 51000385 UPPER RECEIVER KIT MR556A4 11"

HK 51000385 UPPER RECEIVER KIT MR556A4 11" -image

HK 51000385 UPPER RECEIVER KIT MR556A4 11"

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HK 51000385 UPPER RECEIVER KIT MR556A4 11" Unavailable & Discontinued Models

List of Unorderable Models

  • USED, HK 51000385 UPPER RECEIVER KIT MR556A4 11'' , MPN: 51000385-EDEMO , Code: 13-UFH-51000385-EDEMO-RE-C
  • HK 51000385 UPPER RECEIVER KIT MR556A4 11'' , MPN: 51000385 , UPC: 642230270220 , Code: 13-UFH-51000385-51000385
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Last updated 2026-09-04 UTC.