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Thread: Colt AR 15 SP1 Carbine

  1. #1
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    Colt AR 15 SP1 Carbine

    I just bought a 1980 made Colt AR 15 SP1 carbine. I had bought an SP1 rifle last year, so Iím thrilled to have a carbine to go with it. Those are quite rare here in Switzerland. Paid $ 1600 for it.

    And it has a few strange features, if anyone has infos pls chime in.




    Chromed BCG



    Funny looking front pin






    Colt mag with a circled (1)



    Vinyl acetate covered stock



    The nut is staked in two places, with a dab of black paint





    Paint near the bolt release lever



    Full auto hammer



    Sear pin and full auto selector



    The pin is quite lose and falls off



    M16 BCG




    So whatís the story, did Colt build some full autos SP1 carbines ? Or was this transformed by a previous owner ? The auto sear is missing, and I bought this carbine as a semi auto. Could the sear be installed ? I already have two full auto rifles, an M16A1 and an XM177E2.

  2. #2
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    Looks aftermarket conversion to me. IIRC a factory FA Colt would have been marked M16 or M16A1 for their export. Plus wouldíve had 14.5 barrel and normal pivot pin

    JMO

  3. #3
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    If it's the big hole pivot pin, that's just an aftermarket pin instead of the double screw. Is the auto sear hole anodized inside? Looks from the photo that it may have been drilled by someone. That should be a good clue as to whether it came from the factory like that. The auto sear pin needs the auto sear installed to be retained.

  4. #4
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    And pic of both SP1 together


  5. #5
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    Wow that makes me so jelly

    That stock is just cherry. I want a SP1 carbine so bad. Let alone one that has a happy switch.

  6. #6
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    You need Tiger Stripes. They make SP1 anything mehr besser.

  7. #7
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    Definitely something funky with the OP's AR, but ... cool.

  8. #8
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    Quote Originally Posted by CAMagnussen View Post
    Definitely something funky with the OP's AR, but ... cool.
    Itís a conversion. Look at the sear hole. See the silver. Itís gonna walk no matter what. I wouldnt bother with the pin. Or get something rubber to fill in the hole but not interfere with the FCG

  9. #9
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    Congrats on getting the SP1 carbine. I picked up my SP1 carbine (1981) a few years ago. My SP1 (1977) needed some company.



    "A Bad Day At The Range Is Better Than A Great Day Working"

    USMC Force Recon 1978-1984
    US Air Force Res. 1995-2004 (Air Transportation)
    M16/AR15 shooter since 1978, gun collector and AR builder since 2004
    Oath Keeper member
    III% United Patriots member

  10. #10
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    Quote Originally Posted by ALCOAR View Post
    Wow that makes me so jelly

    That stock is just cherry. I want a SP1 carbine so bad. Let alone one that has a happy switch.
    Yes the stock is very nice.

    Identical to my XM177E2, except for the condition; one probably went to war, the other is just a toy.


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