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Good to know that All Bushys are 5.56.

LMT is like that too, Thats what my upper is

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carlson1 wrote:
rocco7869 wrote:
carlson1 wrote:Still for sale!
Forgot to ask what caliber? .223 or 5.56?

Chuck

It will take both.

So then it's 5.56?

You can shoot .223 in a 5.56 rifle, but you should not shoot 5.56 in a .223 rifle, as .223 specs are tighter then 5.56. 5.56 has more 'wiggle room'.
5.56 is also a higher pressure round, And shooting a 5.56 round in a .223 rifle will exceed a .223 pressure rating every shot, possibly causing catastrophic failure.

From Wikipedia:

While the external case dimensions are very similar, the .223 Remington and 5.56x45mm differ in both maximum pressure and chamber shape. The maximum and mean pressures for some varieties of the 5.56 mm (different cartridge designations have different standards) exceed the SAAMI maximums for the .223 Remington, and the methods for measuring pressures differ between NATO and SAAMI.[2] The 5.56 mm chamber specification has also changed over time since its adoption, as the current military loading (NATO SS-109 or US M855) uses longer, heavier bullets than the original loading did. This has resulted in a lengthening of the throat in the 5.56 mm chamber. Thus, while .223 Remington ammunition can be safely fired in a 5.56 mm chambered gun, firing 5.56 mm ammunition in a .223 Remington chamber may produce pressures in excess of even the 5.56 mm specifications due to the shorter throat.[3]

And I know WP is not a 100% reliable source, so here's a few more sources:

Direct from SAAMI Themselves:
http://www.saami.org/Publications/2006U ... ations.pdf" onclick="window.open(this.href);return false; <- Scroll down to page 7.
http://www.thegunzone.com/556v223.html" onclick="window.open(this.href);return false;
http://www.stormfront.org/forum/showthread.php?t=144981" onclick="window.open(this.href);return false;

Just trying to throw out some education for some folks, as I've seen it as a widely held myth that both .223 and 5.56 can shoot each other's ammunition safely.

So, Back to the OP's question, what caliber is it? (What's actually stamped on the barrel?)

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