WTS - BRAND NEW IN BOX BUSHMASTER ORC

[carlson1]

I will through in a Brand New Eotech 5.11 for an extra for $250

[GeekwithaGun]

PM sent

[carlson1]

Still for sale!

[rocco7869]

Still for sale!

PM sent.

[carlson1]

[carlson1]

SPF

[rocco7869]

Still for sale!

Forgot to ask what caliber? .223 or 5.56?

Chuck

[carlson1]

Still for sale!

Forgot to ask what caliber? .223 or 5.56?

Chuck

It will take both.

[carlson1]

Deal Did Not Go Through...

Steal Available.

[dicion]

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?)

[The Annoyed Man]

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

I have a Bushmaster 24" Varminter. You can't see what is stamped on the barrel - if anything - because of the free floating hand guard. However, on the left side of the lower receiver, it says "CAL. .223-5.56MM". However, THIS FAQ PAGE on the Bushmaster website says:

All Bushmaster rifles are chambered to accept 5.56mm ammunition and always have been. The NATO Spec 5.56mm chambers have a longer "leade" or throat than the SAAMI Spec .223 caliber chambers which have about half of the leade or throat of the 5.56mm chambering. While it is safe to fire both 5.56mm and .223 caliber ammunition in our rifles, the 5.56mm ammunition should not be fired in rifles chambered in .223 caliber as they will develop very high pressures.

Emphasis mine...

[dicion]

Good to know that All Bushys are 5.56.

LMT is like that too, Thats what my upper is

[A-R]

I'm by no means an expert on any of this, but I believe the chambering used by Bushmaster (and others) is a "Wylde chamber" that was specifically designed to accept both 5.56 and .223 cartridges. I think - but don't know for sure - there are some rifles out there that will accept ONLY 5.56 and not .223 and vice versa.

[The Annoyed Man]

I'm by no means an expert on any of this, but I believe the chambering used by Bushmaster (and others) is a "Wylde chamber" that was specifically designed to accept both 5.56 and .223 cartridges. I think - but don't know for sure - there are some rifles out there that will accept ONLY 5.56 and not .223 and vice versa.

I don't think so. Wylde chambering is found in Rock River Arms rifles. Bushmaster themselves say their rifles are chambered in 5.56. There's no reason why they would make that claim if it weren't true.

[carlson1]

SOLD