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#1
07-28-2009, 04:13 AM
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5.56 NATO vs .223 Remington
I've been recently hearing a lot of confusions that I want to be clear on. When I was at a gun store with a friend and holding an AR15, I said it's chambered in .223. My Marine buddy then say that it's also called 556, but correct me if I'm wrong. Is there a real difference between what the military uses and that NATO calls 5.56mm to that of the .223 which is by US measurements even though in the US military they still call it a 5.56mm instead of .223.
My question is what is the difference in when we have civilians with AR-15s chambered in .223 vs a military M16 chambered in 5.56mm
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 "There's a fine line between not listening and not caring...I like to think I walk that line everyday of my life." Blessed be the LORD, my rock, Who trains my hands for war, And my fingers for battle Psalm 144:1 “It is always wrong to use force, unless it is more wrong not to.” 
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#2
07-28-2009, 07:16 AM
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The .223 Remington was the cartridge from which the 5.56mm NATO was developed. The 5.56mm NATO is loaded to higher pressures, as all NATO rounds are, and are said to not be safe fired from guns specifically designated for the .223 Remington cartridge. You can fire .223 Remington rounds out of a gun designated for 5.56, as it is the higher pressured cartridge and therefore the gun built for it has higher tolerances. They are the same, but then again, they arent.
This can also be said for the .308 Winchester and the 7.62mm NATO round.
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#3
07-28-2009, 10:39 AM
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That's us civies getting the shit end of the stick, as usual.
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#4
07-28-2009, 10:43 AM
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I'm pretty sure you can buy an AR-15 chambered in 5.56mm NATO, but good luck finding the ammo.
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#5
07-28-2009, 10:51 AM
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Won't any AR-15 with a steel reciever (not alloy crap they usually make them with) withstand higher pressure? My Bushmaster has a steel reciever, so I'm wondering.
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#6
07-28-2009, 11:34 AM
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Actually the original models were all manufactured with high strength Aluminum recievers, and they took the 5.56mm NATO rounds, but as we've learned before, the reciever can be made of pretty much anything, (like plastic or wood). The upper should be fully constructed of steel, and almost always is. A steel reciever would probably make the gun a bit tougher, but add some weight as well.
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#7
07-30-2009, 05:07 AM
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Quote:
The receivers used by Colt, FN, LMT, S&W, DPMS, Armalite, Bushmaster and others are 7075 forgings which is the exact same material used in jet aircraft including the latest fighters like the F-22 and F-35.
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#8
08-25-2009, 10:59 AM
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5 56 NATO vs 223 Remington
I am considering the purchase of a Remington Model 750 semi-auto rifle. Anyone have any experience with this rifle? Doing some research on other forums, there was a lot of posters that had problems with feeding. Also how accurate are they?
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#9
08-25-2009, 11:41 PM
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Quote:
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Hybrid Mode
