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  1. HK416 and HK417 HQ
    Hi everyone! Excuse me if this has been addressed already, but i couldnt seem to find the answer anywhere: 1. Is the MR556 piston interchangable (identical) with the MR762 piston? 2. Is the firing pin srping interchangable (identical) between MR556 anf MR762? Thanks for info!
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