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So I have a Hk416 10.4" Upper and a MR556 Lower. Can I just merger the two and get a working gun? Do I have to change anything else out? I wanted double check with the community before I destroy something :confused:. Thanks!
 

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So I have a Hk416 10.4" Upper and a MR556 Lower. Can I just merger the two and get a working gun? Do I have to change anything else out? I wanted double check with the community before I destroy something :confused:. Thanks!
Plug and Play!! Have several.. Do you have MR556 factory Fire Control Group in the lower still?
 

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Discussion Starter #3
Plug and Play!! Have several.. Do you have MR556 factory Fire Control Group in the lower still?
Yes, everything on the MR556 is still factory. I was thinking that the buffer spring or trigger control group needs to be changes.
 

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^^^^^ I could be wrong but I'm guessing no.
 
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