.223 Rem | 5.56 NATO

Sig Sauer

Sig Sauer M400 5.56 NATO Semi-Auto Rifle with 16-Inch Stainless Steel Barrel and Magpul SL-K Stock

Sig Sauer

Sig Sauer RM40016BTRDV2COIL M400 Semi-Auto Rifle with 16-Inch Barrel and Magpul SL-K Stock

Springfield Armory

Springfield Armory STV916556BLCV2B5 ST VICTR 556 16-inch 5.56 NATO Rifle with B5 Enhanced SOPMOD Stock