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556 223 differences

  1. HK416 and HK417 HQ
    Interested in experiences those of us have had in using 556 & 223 ammo in the MR556. It's been very noticeable in my case. I have used numerous brands of match grade 223, none of which came close to fairly $mid-range 556 brands. My only thought was that there is too much room (by design)...
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