MR556A1 Upper Marking
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Thread: MR556A1 Upper Marking

  1. #1
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    Default MR556A1 Upper Marking

    Hello, just getting into the HK world. I grabbed an MR556A1 upper and was wondering if anyone could explain to me what these markings in the attached picture mean.
    Attached Thumbnails Attached Thumbnails MR556A1 Upper Marking-90abcc9d-7044-45ff-a236-52f42aabbfc5_1585179881217.jpeg  

  2. #2
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    illicit's Avatar
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    Quote Originally Posted by Jdap2211 View Post
    Hello, just getting into the HK world. I grabbed an MR556A1 upper and was wondering if anyone could explain to me what these markings in the attached picture mean.
    Welcome. The 'P' is a proof mark, I'm not exactly sure of the significance. CA is the date code for '20.

    Last edited by illicit; 03-26-2020 at 03:39 AM.

  3. #3
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    anavrin0901's Avatar
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    Wow! Nice you got a '20 model!!! Mine has that P too in front of the BI ('18)

  4. #4
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    Thank you!

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