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Installing Magpul PRS on HK MR308 A3 rifle

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I would like to install a Magpul AR10 PRS butt stock on my rifle and wondered if anyone can tell me whether an American made mil-spec buffer tube will thread in place or if the HK is metric threaded? I know HK is famous for using non-standard parts so you have to buy from HK. I am unable to find info on the thread size of the buffer tube currently installed and am hoping someone can save me having to take the butt stock off to check the threading. Thanks.

P.S. First post - apologies if I have screwed up in any way.
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