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Colt SP1 BCG

shilowar
Would a Colt AR-15 model SP1, s/n SP128xxx, made circa 1980 have a full auto BCG? There is one on the auction side but has a semi-auto BCG including the cut out under the firing pin, and I am thinking that can't be the original BCG as the cut out would have come after the 80s, or am I incorrect?

http://www.GunBroker.com/Auction/ViewItem.aspx?Item=379425509
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Comments

7 comments

Date Votes
  • fordsix
    looks to have been ramped
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  • dcs shooters
    That's a semi-auto BCG there That is correct for the time. It was later that ATF ok'ed M-16 BCG,s ,
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  • fordsix
    it is the correct BCG for the 1980;s
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  • 45er
    Fordsix,

    This visual may help? Along with a bit of dicussion, fourth post down at least distinguishes the different bcg types...

    http://www.uzitalk.com/forums/showthread.php?50426-SP1-bolt-carrier

    Dcshooter-- do you know when the change accured, and if specific for the SP1?

    (Too, if needed, my apology for linking to another forum?)

    45er
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  • dcs shooters
    quote:Originally posted by 45er
    Fordsix,

    This visual may help? Along with a bit of dicussion, fourth post down at least distinguishes the different bcg types...

    http://www.uzitalk.com/forums/showthread.php?50426-SP1-bolt-carrier

    Dcshooter-- do you know when the change accured, and if specific for the SP1?

    (Too, if needed, my apology for linking to another forum?)

    45er






    Go to www.biggerhammer.netand look at AR15/M16 FAQS there is bolt info there, like this.
    http://www.biggerhammer.net/ar15/barrelsbolts/boltgenesis.html
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  • shilowar
    quote:Originally posted by 45er
    Fordsix,

    This visual may help? Along with a bit of dicussion, fourth post down at least distinguishes the different bcg types...

    http://www.uzitalk.com/forums/showthread.php?50426-SP1-bolt-carrier

    Dcshooter-- do you know when the change accured, and if specific for the SP1?

    (Too, if needed, my apology for linking to another forum?)

    45er






    I am aware of how F/A works, and the various types of BCGs I just didn't think the cut out BCG was that early, I guess i assumed the cut out semi BCG was introduced during the AWB years.. I didn't want to bid on a rifle that may have had the BCG changed out. I was looking at a 6520 from 1986 that has the fully open tail on the BCG with the cut out under the firing pin so it makes sense.

    I appreciate the responses, thanks!
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  • nmyers
    The BCG on my 1983 SP1 looks identical to the one pictured in the ad, including the FA notches on the side.

    The wear on the under side of the BCG pictured shows a fair amount of wear. I'd really like to see a close up of the bolt lugs to determine how much they are worn.

    Neal
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