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Thread: What Calibers fit in an AR-15 lower?

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    What Calibers fit in an AR-15 lower?

    Without changing lower receivers, what calibers can fit in the AR-15 lower? I know .22LR and 9mm fit in it, but what else can it be converted to?

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    6x47
    7.62x39
    6.8 SPC
    204 Ruger
    6.5 Grendel
    30 Remington AR (not sure if is officially released or not)
    various wildcats

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    There are so many:

    22lr
    5.56/.223
    9mm
    50AE
    440 CORBON
    300 Whisper (300 Fireball)
    204 Ruger
    20 Tactical
    458 SOCOM
    338 Spectre
    50 Beowulf
    499 Leitner-Wise
    450 Bushmaster
    6.8 SPC
    6.5 Grendel
    5.45x39 (.21 Ghenghis )
    7.62x39
    .223 WSSM
    .243 WSSM
    .25 WSSM

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    Wow, that's awesome. Thank you for listing all of these. Sounds like the AR-15 lower is a highly adaptable "gun".

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    7.62 will not fit in a normal AR lower. I don't know why people keep saying it.

    Are there AR-styled rifles that do shoot 7.62? Yes. But do they use the same lower as a normal 5.56 AR? No.

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    Quote Originally Posted by justin_247 View Post
    7.62 will not fit in a normal AR lower. I don't know why people keep saying it.

    Are there AR-styled rifles that do shoot 7.62? Yes. But do they use the same lower as a normal 5.56 AR? No.
    This is why I mentioned it, but don't know if the magwell is somehow different, it doesn't look like it.

    http://www.dpmsinc.com/firearms/firearm.aspx?id=24

    Also:

    http://www.del-ton.com/Comp_Magazine_p/mp1009.htm

    http://www.del-ton.com/AR_15_Barrel_p/cv1033.htm

    Also:

    http://www.gunblast.com/Doublestar-762x39.htm

    Not to mention:

    http://www.gunbroker.com/Auction/Vie...Item=162287454

    Or:

    http://www.44mag.com/prodinfo.asp?number=CP76230

    and more...

    http://www.ar15.com/forums/topic.htm...f=364&t=181569

    Last edited by SHIVAN; 04-13-10 at 14:30.

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