Dumb question?

Discussion in 'Auto & Semi-Auto Discussion' started by juststartin5272, Apr 27, 2013.

  1. juststartin5272

    juststartin5272 New Member

    May seem like a stupid question but I just would like to be certain. There are guns labeled as. 223 rem, then you have. 223/5.56 guns which shoot both. But if a gun is only marked 5.56 does that mean anything? Can regular. 223 be shot from it. Once again sorry if this is a stupid question
  2. readygirl

    readygirl New Member

    You can shoot .223 from a gun chambered in 5.56 (just wont be quite as accurate) but not the other way around. The 5.56 is a higher pressure round

  3. juststartin5272

    juststartin5272 New Member

    I knew you couldn't shoot 5.56 from a .223 weapon just had never seen a rifle marked only as 5.56 so better safe than sorry lol
  4. Vikingdad

    Vikingdad New Member

    Many (most or all?) military style Modern Sporting Rifles (AKA "AR") are marked only 5.56. Is that what you mean? You can shoot .223 out of them but as stated they will not be as accurate. I reload .223 brass for my 5.56 AR though. The brass may not last as long but other than that it is not remarkably different.
  5. locutus

    locutus Well-Known Member Supporter


    When it comes to safety, the ONLY stupid question is the one you DIDN'T ask!:eek:

    Never hesitate to ask questions.:) Someone else may learn something as well as you!:D
  6. kbd512

    kbd512 Well-Known Member Lifetime Supporter

    Apart from custom "match" rifles and carbines, there are three common chamber variations for AR barrels:

    1. 5.56MM NATO - Permits firing of 5.56MM NATO and .223 Remington (with slightly reduced accuracy).

    2. .223 Remington - Permits firing of .223 Remington (5.56MM NATO can produce chamber pressure spikes depending on how close the chamber size is to specification).

    3. .223 Wylde - Permits firing 5.56MM NATO and .223 Remington with roughly equivalent accuracy and without a potentially dangerous pressure spike associated with firing 5.56MM NATO.

    It makes no difference what markings are on the receiver of a firearm. Marking a receiver "multi-caliber" doesn't make the barrel any more capable of withstanding the firing of a particular cartridge. Pay special attention to the marking on the barrel. If your barrel isn't marked, contact the manufacturer to be sure your rifle or carbine can fire the type of cartridge you intend to fire.

    For example, a Colt AR6721 has a barrel marked "5.56 NATO / 1/9 HBAR". The receiver of the same firearm is marked "Cal. .223". The firearm is chambered for 5.56MM NATO ammunition and will also fire .223 Remington.

    Also, while some cartridges may chamber in a 5.56MM NATO barrel, that doesn't mean a particular firearm is suited for firing them. The extra heavy 5.56MM long range bullets (heavier than 77 grains) come to mind. A bolt gun may feed such cartridges, but your AR magazines may have problems with them.

    Generally speaking, 5.56MM NATO ammunition from 55 to 77 grains will work just fine in a 5.56MM NATO chambered barrel with an appropriate twist rate.

    Generally speaking, .223 Remington will also work just fine in a 5.56MM NATO chambered barrel, with slightly reduced accuracy.

    Generally speaking, firing a higher pressure, dimensionally variant cartridge like the 5.56MM NATO in a weapon chambered for .223 Remington is not a particularly good idea.