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check page 13 (if I recall correctly) of the manual -it says it right there.
5.56 in any ".223" mini is good to go (except the Target model)
if you don't have a manual - download one for free on rugers website.
5.56 in any ".223" mini is good to go (except the Target model)
if you don't have a manual - download one for free on rugers website.