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Colt SP-1 questions

Discussion in 'Black Rifle Forum' started by esh325, Oct 31, 2011.

  1. esh325

    esh325

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    Is the barrel on a Colt SP-1 .223 or 5.56? Is the bolt itself made for .223 or 5.56? I know it's not milspec as it has the cut out.
     
  2. faawrenchbndr

    faawrenchbndr DirtyThirty fan CLM

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    All Colt barrels are chambered in 5.56mm.
    There is no designation for a 5.56 or .223 bolt
     

  3. WayaX

    WayaX Lifetime Member

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    I think you're to the bolt carrier being "M16" vs "AR-15". There is no difference between a 5.56 bolt and a .223 bolt (as faawrenchbnder was saying).
     
  4. mixflip

    mixflip

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    My father in laws SP-1 slabside that he bought brand new in 1976 says "cal .223" right on the lower receiver.
     
  5. TedG

    TedG Infidel USA

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    What does it say on the barrel?
     
  6. wdphillips

    wdphillips

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    I had the same question a couple of days ago. I was getting ready to order some IMI ammo for my 1976 Colt SP1 and I wanted to make sure they would chamber.

    I went to Wikipedia and read the history of the AR and convinced myself that the original AR platform was based on the 5.56mm.

    I guess I should wonder how reliable is the information on Wikipedia! But I believe it is correct.
     
  7. TedG

    TedG Infidel USA

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    WIKI is only as good as the person that entered the information. It is not to be considered the definative answer for anything.
     
  8. faawrenchbndr

    faawrenchbndr DirtyThirty fan CLM

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    But the BARREL will state 5,56mm,.....All Colt's are chambered in 5.56mm:whistling:
     
    Last edited: Oct 31, 2011
  9. mixflip

    mixflip

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    Actually the barrel does not mention any caliber at all? I thought that was odd. It does say MP but no caliber is marked on the barrel? The only caliber mentioned on his SP-1 is on the lower and that says cal.223
     
    Last edited: Oct 31, 2011
  10. wdphillips

    wdphillips

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    Mine is as such, no visible caliber markings on the barrel, cal .223 on the lower.

    "if your AR is marked C MP it means it was made by Colt and the barrel was magnafluxed and proofed"
     
  11. faawrenchbndr

    faawrenchbndr DirtyThirty fan CLM

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    Call Colt to verify,.........but, ALL Colt's are chambered in 5.56mm
     
    Last edited: Nov 1, 2011
  12. fnfalman

    fnfalman Chicks Dig It

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    All of the military semiautos were chambered for 5.56mm regardless of .223 marking. Some back in the days even marked 5.56mm/.223 (Galil for one). They marked the guns that way so that people wouldn't get too confused because both rounds will work.
     
  13. quichedem

    quichedem

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    ... So can SP-1 owners shoot 5.56?
     
  14. faawrenchbndr

    faawrenchbndr DirtyThirty fan CLM

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    As long as you like shooting 5.56mm out of a 5.56mm chamber!:whistling:
     
  15. wdphillips

    wdphillips

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  16. fnfalman

    fnfalman Chicks Dig It

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    Yes. But I wouldn't recommend .222 Remington or .220 Swift.:embarassed:
     
  17. quichedem

    quichedem

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    Thanks, but I didn't need any smart-ass replies. Please take that foolishness elsewhere...

    To the other nice folks who replied: I'm a noob when it comes to these rifles, and I know there is a difference between the .223 and 5.56. I was always told that you use ammunition that the weapon is clearly marked for. I'm assuming SP-1 owners shoot 5.56 in their .223 marked lowers from what I've gathered in the thread. I will call Colt if I feel I need it verified, but I was curious if the SP-1 owners shot 5.56 if their lowers had only ".223" on it.
     
  18. faawrenchbndr

    faawrenchbndr DirtyThirty fan CLM

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    Lighten up Francis! :laughabove:


    I've been shooting the M-16 & AR15 for 27 years. Many answered your questions
    here. There is also a TON of info to be found on Google within seconds.
    Use it, it's your friend!

    Also, try to get a sense of humor,.......try Wam-Mart, isle 43