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Dwayne G. asked 7 years ago:
Dwayne, this rifle's barrel is stamped 5.56NATO and will fire both 5.56 and 223 just fine.
James G.
7 years ago
it will safely fire either 223 or 5.56with no issues I swap back and forth with no issues in my M&P 15
Randy I.
7 years ago
