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it is fine with both specs 5.56mm NATO / .223 Remington cal. Black anodized A3 flattop receiver w/ Integral Picatinny Style Rail System. 20" matte Stainless Steel chrome-lined bbl w/ no sights & 1:8 twist. Skeletonized full length buttstock. 2-Stage Match trigger, Aluminum free float FA w/ stud for bipod. Includes soft-lined Tactical Case w/ mag pockets. One (1) 10-shot mag

Adam, the performance center M&P15 is actually 5.56mm NATO/.223 chambered and will handle both 5.56/223.