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What does ACP mean?

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7 comments

  • nitrouz
    Automatic centerfire pistol I think. I'm no pistol expert but I bought a couple .45's in January. .45 auto and .45 ACP ammo is the same.....I think...anyone want to confirm this or am I off?
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  • Travisshai
    Thanks for the answer it sounds correct to me, but why are the ACP45s generally cheaper is it less of a gun.

    Travis S. Gaines
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  • sundowner
    ACP=Automatic Colt Pistol
    Exactly what firearms are you considering?
    Most semi-auto's chambered in .45 cal take .45 ACP
    Most revolvers chambered in .45 cal take .45 Long Colt, but some take .45 ACP with moon clips.
    Chances are you are talkin' apples and apples, but if you told us what firearms you are trying to choose from, someone might be able to provide more specific info and insight.


    ". . . let me forget about today until tomorrow"
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  • Travisshai
    I am looking to purchase a S&W 99 45ACP or Smith & Wesson 45 Tactical Model 4553TSW

    Travis S. Gaines
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  • captkirk3@dslextreme.com
    Answer... .45ACP = Automatic Colt Pistol....

    Captain Kirk, Tech Staff
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  • Iconoclast
    Travis, welcome to the GB forums!

    When the .45 Colt semi-auto was introduced, the "ACP" designation (accurately translated by the experts above) was deliberately chosen both for: (a) marketing, to associate the Colt name with the round and (b) clarity, to distinguish between it and the very popular .45 ("Long") Colt which had an illustrious history beginning with the Colt Single Action. These elements are seen throughout cartridge nomenclature - witness, for example (without launching into a windy treatise), the .223 Remington, .280 Remington, .308 Winchester, .307 Winchester, .40 S&W, .45 Glock (new), etc. ad infinitum. Cartridge names almost always have had some marketing angle attached to the choice, even in the earliest days of self-contained ammunition, with technical accuracy a secondary consideration (e.g., .38 S&W & .38 Special which are actually .36 caliber and descendants of the .36 black powder revolvers in bore if nothing else).
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  • cbxjeff
    Welcome Travis. You will find this forum to be a huge source of information and advise. I know I have and I've just begun.

    cbxjeffIt's too late for me, save yourself.
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