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For the life of me, I can't see a difference. And they appear to fit as well...I've swapped one from a MR556 to a MR762, and vice versa. Are the part numbers the same? HK Parts lists the MR556 piston rod assembly, but doesn't list one for the MR762. Thanks in advance.
 

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The piston rod are identical for the MR556,MR762,HK416,HK417, The piston is the same and is also same for G36 (except K,C have a shorter piston).
 

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Thats a negative on the G36 versus HK416/417/MR223/MR308, the gas piston is indeed identical (the HK416PDW uses the same gas piston as the G36C/G36K, and the regular HK416 uses the same as the regular G36), but the piston rod for the G36 is definitely not the same as that for the HK416/417, the former is a fair bit thinner than the latter.
 

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Thats a negative on the G36 versus HK416/417/MR223/MR308, the gas piston is indeed identical (the HK416PDW uses the same gas piston as the G36C/G36K, and the regular HK416 uses the same as the regular G36), but the piston rod for the G36 is definitely not the same as that for the HK416/417, the former is a fair bit thinner than the latter.
Agree with your statement that “piston rod assembly” is not the same between G36 and HK/MR platforms.
OP asked about MR556 vs MR762 “piston rod assembly” which is the same; and “piston” which is also the same. I added the piston is also same as the G36 piston except for K/C.
 

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Agree with your statement that “piston rod assembly” is not the same between G36 and HK/MR platforms.
OP asked about MR556 vs MR762 “piston rod assembly” which is the same; and “piston” which is also the same. I added the piston is also same as the G36 piston except for K/C.
Ah, my apologies, I read it the wrong way!
 
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