How does this ar-15 conversion kit work if...

This is a discussion on How does this ar-15 conversion kit work if... within the Cartridges & Calibers forums, part of the Sniping Related category; Isn't a .223 round bigger in diameter than a .22lr round? How would this conversion kit work without swapping the barrel for a .22 barrel?...

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  1. #1
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    How does this ar-15 conversion kit work if...

    Isn't a .223 round bigger in diameter than a .22lr round? How would this conversion kit work without swapping the barrel for a .22 barrel?



  2. #2
    Senior Member hawk's Avatar
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    The actual measured caliber for 22lr is actually .223 and therefore the same dimension as the larger .223 remington. Well, kinda true (the .223 caliber remington has a bullet diamter of .224 and the .222 caliber remington magnum also has a .224 bullter diameter. At any rate the 1/1000 of an inch in diameter difference produces no real problems and is safe especially since the bore diameter is the slightly larger of the two.

    There are many confusing names given to rounds out there. Example: is the 303 british smaller in diameter than the 308 winchester? No it's larger the 308 is a true 308. The 303 is actually .311 (so is the russian 7.62x39).
    Hawk

  3. #3
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    Oh ok, the difference is too small to have any effect. Thanks

  4. #4
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    The second point is that the chamber adaptor is 0.223 (not 0.224) so the bullet gets going before entering the barrel with the larger bore diameter.

    Secondarily, the bullet is made of lead and the base will expand under the pressure behind it to seal the 0.224 bore. {Think: Mine Ball}

  5. #5
    Senior Member Dust_Remover's Avatar
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    That sounds like he does the voice of Cleveland in Family Guy.

    Branden
    Once you go FDAC, you'll never go back!

    -Me

  6. #6
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    I believe that aguila also makes .224" LR rounds.

  7. #7
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    Caliber is ususally measured in two ways: diameter between lands and diameter between grooves. A bullet is usually correctly sized if it is the same size as the groove diameter. A .30-06, .308 Win, and .300 Win Mag are all .30 caliber rounds measured between the lands, with .308 diameter grooves, and shoot a .308 caliber bullet.

    An exception to the bullet size is if you are shooting a lead bullet. Lead bullets are usually slightly undersized(but still over the land diameter) and have a lubricant placed either in grooves or over the entire bullet. The lubricant actually seals the gap left in the bore and prevents propellant gas from leaking past the bullet.

  8. #8
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    Adapter kits suck

    Reason being besides diameter differences between 22lr and .223, A) the adapter has about a 2 inch free bore chamber with no rifling so by the time the bullet hits the barrel it already has mucho fps, B) the rifling of a 22lr is 1-16" for your typical .223 its between 1-12 and 1-7", way too fast for the 22lr. A conversion kit in my Rock River Varmint that can do 3/4"@100yds had a hard time hitting a soda can at 25yds. For quality rimfire practice, I would get a dedicated 22lr upper or build a Ruger 10/22 to imitate your AR as close as possible.

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