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Jeffrey A. asked 5 years ago:
Jeffrey, this barrel is stamped .5.56 Nato. https://en.wikipedia.org/wiki/Ruger_American_Rifle
James G.
5 years ago
It is a 223 barrel so itd be better to use only 223 and no 556.
Paul F.
5 years ago
MARKED 5.56. Can chamber both .223 and 5.56. Cheers!
Trin K.
5 years ago
