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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 13:30.

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    7.62x51 will not fit, but as far as I know 7.62x39 will.

    -RD62

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    I think there was an article about a .410 upper out there ? Not 100% on that thou.

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    This list was posted on another forum:

    AR-15, without bolt modification
    .17 Remington
    .20 Tactical
    .204 Ruger
    .221 Fireball
    .222 Remington
    .222 Remington Magnum
    .223 Remington (5.56x45mm)
    .223 Remington Ackley Improved
    6x45mm
    6mm Whisper
    6.5mm Whisper
    7mm Whisper
    7mm TCU
    .300 Whisper (.300/221, .300 Fireball)
    .338 Whisper


    AR-15, with bolt modification
    223 WSSM
    5.45x39mm (.21 Genghis)
    243 WSSM
    6mm PPC
    6mm BR Remington
    6.5mm PPC
    6.5mm Grendel
    25 WSSM
    6.8x43mm SPC
    .30 Herrett Rimless Tactical (6.8x43mm case trimmed to 41mm and necked up to .308; the 6.8mm version of the .300 Whisper)
    7.62x39mm
    .30 RAR
    300 OSM
    .357 Auto
    .35 Gremlin (necked up 6.5 Grendel to 35)
    .358 WSSM (various names, but all are some form of a WSSM necked up to 35 caliber, some are shortened to make them big game legal in Indiana)
    .458 SOCOM
    .50 Action Express
    .50 Beowulf


    AR-15 using a simple blowback operation
    .17 HMR
    .22 LR
    .22 WMR
    9x19mm
    40S&W
    10mm Auto
    45ACP
    Colt SP6920, LE6920, 6720
    BCM Lower/ARP 6.8SPC upper for hog hunting
    DD M4V5 clone, Troy 5.56 Carbine, S&W M&P10
    PSA Lower/BCM LW 16" middie CHF upper
    2 PSA 18"6.8 rifles, PSA 20" M16A4 clone
    Remington 870, Remington 700VTR
    SA XDm9, XDm9C, , XD9SC S&W 1911
    Ruger SR9c, GP100, Hawkeye77 Compact 6.8SPC
    Kel-Tec KSG, Marlin 336 30-30
    Sig 1911 Tacops, M11A1, P226 Mk25

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    AR-15 using a simple blowback operation

    I don't know squat about the following: I have read that blowback systems using relatively heavy loads (e.g., 45 ACP, 9mm) will shorten the life of either a lower, upper, or both.

    True?
    'That whole effort was held together by sweat, shame, and a tiny bit of pride.' -- Son of Commander Paisley

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    As for all of those, which would be the best for hunting mule deer and quite possibly elk? Any, which ones?

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    Quote Originally Posted by Hotsauce View Post
    As for all of those, which would be the best for hunting mule deer and quite possibly elk? Any, which ones?
    6.8SPC would be good for mule and could work for Elk as well.

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    Quote Originally Posted by Hotsauce View Post
    As for all of those, which would be the best for hunting mule deer and quite possibly elk? Any, which ones?

    This is the classic problem which I have struggled with for some time. The 6.8 spc will work for mulies out to 300 yards, but it is light for the task. The 6.5 Grendel does a bit better job, but is still lacking power for the long shots. The 7.62 x 39 likewise will take deer out to 300 yards, but is anemic for elk.

    Sadly, the only rounds there which I personally would consider adequate for elk are the 458 Socom and the 50 Beowulf, but those are not long range cartridges. A pretty good elk rig would be an AR10 in .338 Federal. A good longer range deer rig would be an AR10 in 6.5 creedmoor. But I prefer the smaller dimensions of the AR-15, so it puts me in a quandry.

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