.223 Rem | 5.56 NATO

Springfield Armory

Springfield Armory Hellion SPG HL916556B 5.56x45mm NATO Bullpup Rifle with 16-Inch Barrel and Adjustable Stock

Springfield Armory

Springfield Armory SPG SA920556BA2 5.56x45mm NATO Semi-Auto Rifle with 20-inch Barrel and A2 Fixed Stock

Springfield Armory

Springfield Armory SPG HL920556BCA Hellion 5.56 NATO Bullpup Rifle, 20-Inch Barrel, Black Finish

Springfield Armory

Springfield Armory HL916556Y Hellion 5.56 NATO 16-inch Bullpup Rifle in Gray

Springfield Armory

Springfield Armory HL916556YLC Hellion 5.56 NATO 16-Inch Bullpup Rifle in Gray

Springfield Armory

Springfield Armory Hellion SPG HL916556F 5.56mm NATO Bullpup Rifle with 16-Inch Barrel in Flat Dark Earth

Springfield Armory

Springfield Armory HL916556G Hellion 5.56mm Bullpup Rifle with 16-Inch Barrel and Ambidextrous Features

Springfield Armory

Springfield Armory ST VICTR 556 16-inch Rifle with 30+1 Capacity and B5 Enhanced SOPMOD Stock

Springfield Armory

Springfield Armory STV916556CBV2B5 ST Victor 5.56 NATO Rifle with 16-inch Barrel, Ambidextrous Safety and B5 SOPMOD Stock

Springfield Armory

Springfield Armory STV916556TV2B5 St. VICTR 5.56 NATO Rifle with 16-Inch Barrel and B5 SOPMOD Stock

Springfield Armory

Springfield Armory STV916556BCAV2 ST VICTR 5.56 NATO 16-inch Rifle with B5 Enhanced SOPMOD Stock

Springfield Armory

Springfield Armory STV914556BV2B5 ST VICTR 5.56 NATO AR-15 Rifle with 14-Inch Barrel and B5 Enhanced SOPMOD Stock