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223 -vs- 5.56: FACTS and MYTHS - YouTube
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What's the Difference Between 5.56 and .223? Are They Interchangeable? Does it Matter? - The Truth About Guns
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5.56 vs. .223: Which Can I Shoot? - The Armory Life
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Ruger® AR-556® 5.56 NATO / 223 Rem Autoloading Rifle, 16.10" - Runnings - Runnings
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223 Remington - Wikipedia
223 Remington - Wikipedia
5.56 vs. .223: Which Can I Shoot? - The Armory Life
223 Remington | Gun Wiki | Fandom
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The Versatile 223 Remington — Ron Spomer Outdoors
