HK MR556 & HK 416 10.4" 556 Upper Conversion Kit Build From Scratch? Feasible? - Page 3
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Thread: HK MR556 & HK 416 10.4" 556 Upper Conversion Kit Build From Scratch? Feasible?

  1. #21
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    Quote Originally Posted by MasonGui View Post
    no you are fine a good 9 inch used Q rail usually run about 200 bucks the only thing i need now is a upper receiver....
    I bought mine from Numrich gun parts. Complete 416 upper receiver for $419. Non marked so I think that means it’s considered a “replacement” upper. At least that’s what I’ve read on here.


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  2. #22
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    Quote Originally Posted by jhammon2287 View Post
    I’m using the bcg from my MR556 and just swapping back and forth. I’m not planning on running full auto so it’s not really a big deal. It’s the 416 bcg that doesn’t run in the mr upper, mr bcg runs just fine.


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    Speak of full auto, I got a Franklin BFS3 and yesterday I put it my MR556A1 and it runs no problem ...... But I really do not know how my MR556 will hold up to "Full Auto" 500-600RPM

  3. #23
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    Quote Originally Posted by jhammon2287 View Post
    I bought mine from Numrich gun parts. Complete 416 upper receiver for $419. Non marked so I think that means it’s considered a “replacement” upper. At least that’s what I’ve read on here.


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    thanks for the parts i just garbed one form them a Complete 416 upper receiver for $419 i am in

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  5. #24
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    Quote Originally Posted by MasonGui View Post
    thanks for the parts i just garbed one form them a Complete 416 upper receiver for $419 i am in
    No problem!


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  6. #25
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    Kind of finish my build there is link https://www.hkpro.com/forum/hk416-hk4...d-scratch.html

  7. #26
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    IGF now sells barrel extensions for you upper so you may be able to take a file lengthen DI, CHF barrel shorten it and put the HK piston system on it to make you 416 clone closer to a true 416. Especially with it being chrome lined. I am thinking of picking one up just to start another project.


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  8. #27
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    Quote Originally Posted by afang View Post
    IGF now sells barrel extensions for you upper so you may be able to take a file lengthen DI, CHF barrel shorten it and put the HK piston system on it to make you 416 clone closer to a true 416. Especially with it being chrome lined. I am thinking of picking one up just to start another project.


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    I thought hk rifles had different threads for the extensions?

  9. #28
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    Quote Originally Posted by ipsilateral View Post
    I thought hk rifles had different threads for the extensions?
    They do. The thread pitch is completely different. I've removed an MR extension and tested the theory. They are incompatible.

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