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Thread: Colt SP1 (R6000) Barrel Markings

  1. #1
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    Colt SP1 (R6000) Barrel Markings

    Good afternoon. I recently purchased a Colt SP1 (R6000), which based off of the serial number dates to 1975. What concerns me is that the barrel markings read "MP CHROME BORE". My understanding and research tells me that there should always be a 'C' marking on Colt rifles. It is common knowledge that Colt just used whatever parts they had available (including Govt. contract parts) and I cannot find any conclusive info on the inter-webs, so I am hoping that some of you Colt experts can set me straight on the matter. Somewhere I was reading that there is sometimes a marking on the barrel between the FSP clamps, but I see nothing there either. My fear is that this rifle was re-barreled at some point or the upper is not Colt. Your expertise is appreciated.

    IMG_0749.jpgIMG_0750.jpg
    Last edited by Cuda444; 11-11-17 at 14:09.

  2. #2
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    Looking at the picture, there does appear to be slight evidence of a C before MP. It looks like a really light strike showing the top of the C. It is in line with the rest of the markings.
    "A Bad Day At The Range Is Better Than A Great Day Working"

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  3. #3
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    My early 80's SP1 has the "C", as did all of the M-16 A1's that I remember from my time in the Army.
    U.S. Army vet. -- Former career LEO. -- NRA Life Member.

  4. #4
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    Quote Originally Posted by Renegade04 View Post
    Looking at the picture, there does appear to be slight evidence of a C before MP. It looks like a really light strike showing the top of the C. It is in line with the rest of the markings.
    I agree, the entire C is faint but unmistakable in the photo.

    Andy

  5. #5
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    Keen eyes gentlemen! Thanks for the input, I would never have noticed the mark.

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