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proper way for breaking in an AR-15
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May 7, 2010, 12:23 AM
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dsa1115
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Join Date: March 10, 2010
Location: Illinois
Posts: 444
don't use 5.56 ammunition in a gun chambered for .223 because of higher pressures of the 5.56. But you can use .223 ammunition in a gun chambered for 5.56 There is a difference of about 10,000 CUP between these cartridges.
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