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HK MR556 & HK 416 10.4" 556 Upper Conversion Kit

SKU: HKP-17824
Brand: GSG9

MR556 & HK416 Upper Conversion Kit - 10.4"

Small number FINALLY back in stock!

Finally an answer for all of those that have been wanting a 10.4" 416 or MR556 upper or a barrel option for your MR556, CR556 & HK 416's. Each upgrade kit is as close as you can get for those that want a HK 416 style upper upgrade but without the excessive price tag of a factory German HK 416 upper kit. This is the finest offering ever available here in the USA. Each barrel kit will work on any HK 416 or MR556 upper receiver. Each unit is test fitted on HK416 & MR556 uppers for accuracy and compatibility. Works with all HK spec uppers & forearms.


Each USA made 10.4" barrel conversion kit includes:

  • Proven Gas Piston Design
  • 10.4" 416R Stainless 1/7 twist 5.56 fully "Nitrided" barrel
  • Muzzle end threaded 1/2 X 28
  • Enhanced stainless steel barrel nut
  • Newer ultra desireable updated 416 stainless steel "vented" gas block
  • Full machined bayonet lug & ambi sling loops on gas block
  • A2 416 style flash hider & crush washer
  • Barrel nut install & removal tool included for ease in making the barrel swap simple and easy to do for for the average shooter. We also offer stand alone "spare" barrels that just arrived along with the upper kits for those that want a spare barrel as well.


Each conversion kit includes all the necessary parts you need for the barrel conversion to your HK 416 or MR556. Simply add your gas piston assembly, upper receiver & bolt carrier group. Why spend needless thousands of dollars on used PD trade in 416 uppers or imperfect cut down MR556 conversions when you can have the closest thing for a fraction of the price. 100% USA made!


No FFL required as the upper assembly is considered parts & not an FFL item.


*Should not be used with a suppressor, unless it is a zero pressure suppressor*

Condition: New
Origin: USA
Price: $649.95
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HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
HK MR556 & HK 416 10.4" 556 Upper Conversion Kit
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Product Reviews

Write your own review


"Amazing Value, Soild Kit"

Will Tillnuck on 5/10/2016 12:29:52 AM

Overall Product Rating:


I was a little skeptical because of the great price this option presented. I am happy to report for those on the fence that this upper kit is a great kit and a fantastic value. I installed this kit in about 20 mins start to finish taking my time. The provided tool made the conversion brainless and easy to swap. Overall fit and finish are nice and as clean as the HK parts I have only none are cast. These appear to be machined with a few machine marks here and there. I did have a little rust on th... More details