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In page 5.56×45mm NATO:
"In more practical terms, as of 2010 most AR-15 parts suppliers engineer their complete upper assemblies (not to be confused with stripped uppers where the barrel is not included) to support both calibers in order to satisfy market demand and prevent any potential problems. Some manufacturers have begun offering a hybrid .223 Wylde chamber designed to optimally support both cartridges.[citation needed]
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