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Thread: Just won an SP1 upper from GB.

  1. #11
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    Quote Originally Posted by big jmh View Post
    I was amazed at the prices they wanted for just the Colt lower receiver.

    Good luck with your project.

    John
    I know, it is crazy. I will acquire one someday. Anybody here have one they would be willing to part with?
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  2. #12
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    Threw it on my A1 lower just to see. Fits good and pretty tight.

    SP1inst1.jpg

    SP1insta2.jpg
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  3. #13
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    That looks good! Assuming my monitor is ok, the color match is close.
    I'm only up to swapping parts on AR's; never done a full build. What is the torque spec for screwing on the barrel?

  4. #14
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    Quote Originally Posted by Don in IA View Post
    That looks good! Assuming my monitor is ok, the color match is close.
    I'm only up to swapping parts on AR's; never done a full build. What is the torque spec for screwing on the barrel?
    Thank you! The color match is not near as close as it looks. The florescent lighting and my camera does not do colors well indoors. The upper is actually much lighter than the lower.

    I apply a good moly grease to the receiver threads to start with. I then install the barrel and barrel nut and torque/un-torque to 30 ft.lbs. three times to pre-stretch the threads. After the third time, tighten just enough just to line up the gas tube in the barrel nut notches. Do not exceed 80 ft. lbs. while doing the line up phase, it should not take that much anyways. Less is better.

    Line up the closest notch until even on each side of the gas tube.

    AR barrel nut.jpg
    Last edited by scottz63; 10-28-2018 at 06:31 AM.
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  5. #15
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    Just got in an SP1 charging handle and large front pivot pin from GB. 2 more parts down!

    SP1hanpin1.jpg

    SP1hanpin2.jpg
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  6. #16
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    You'll have that built soon. I've found with projects like this, in my case looking for old motorcycle parts, the hunt is half the fun.

  7. #17
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    Quote Originally Posted by Don in IA View Post
    You'll have that built soon. I've found with projects like this, in my case looking for old motorcycle parts, the hunt is half the fun.
    Yes, the hunt for parts and the build is at least half the fun for me, maybe more than half. Lol
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  8. #18
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    Just dug out some old triangular handguards and cleaned them up for when I get a barrel assembly. They had some 20+ year old masking tape wrapped up around them. Made for a sticky nasty mess. A bit of 0000 steel wool and mineral spirits cleaned them right up though.

    SP1hgs.jpg
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  9. #19
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    Scott:
    Here is where I go for small AR parts.
    I think shipping is $4 for under $100.
    (I usually buy extra spare parts to get it close to $100.)
    www.jsesurplus.com


    If your needing some small parts for you SP1 build I would get them here until you can find the real ones.
    Save the reproduction parts for your next build. THERE WILL BE MORE.
    Example: Retro style 3 prong flash hider $8 with washer, $7 without.



    I would get one of the blem lowers from BROWNELLS, (601) to use with the upper you have.
    It is closer to what your trying to build.
    The color is off some, more green tint than normal.
    They have them for $125.

    (I bought 2 more of them a few weeks ago)
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    Last edited by Planning; 11-09-2018 at 04:25 PM.
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  10. #20
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    I already have a clone built mostly from repro parts (all except for furniture and sights) I did a few years ago. This one I want to build from all vintage Colt parts, no matter how long it takes me. Lol

    Thanks for the links though Ron.

    m16new1.jpg
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