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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

    What does it say on the barrel?
     
  6. 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

    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. 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. ... 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. fnfalman

    fnfalman Chicks Dig It

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    Yes. But I wouldn't recommend .222 Remington or .220 Swift.:embarassed:
     
  16. 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.
     
  17. 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