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Yes it is fine with the 5.56 ammo The barrel is marked for both See ***** UPC: 022188879674 Description: S&W M&P15SPTII 223 16 30R CTRD Brand: Smith & Wesson Model: M&P 15 SportII With Red Dot Type: Rifle: Semi-Auto *******Caliber: 5.56 NATO|223 Finish: Black Action: Semi-Automatic Stock: Black Synthetic 6 Position Telescoping Sight: Crimson Trace Red or Green Dot Barrel Length: 16 Overall Length: 32 - 35 Weight: 6.85 lbs Capacity: 30+1 # of Mags: 1 Safety: Manual Safety Receiver: Alloy Receiver, 7075T6 Alum Features: 1-9 Rifling, Dust Cover, Forward Assist; Magpul MOE M-LOK Handguard, Crimson Trace Red Dot

Fred, the S&W M&P15 SPT II's Barrel is actually stamped 5.56NATO so will be fine firing both 5.56 and .223. .223 is usually listed for 5.56 firearms to signify that both can be fired safely Sir.