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Hi Roland and welcome. This lower will work on the Ruger AR556 upper no issue. Cheers, stay safe and enjoy!

Yes, it will fit & function properly.

Good evening to you!! Yes the Franklin Armory BFSIII will fit and function on your Ruger AR 556. Have a good rest of your night.

Hi yes it will fit on any ar15 m4 upper.i build ars and u can change them all around with in reason.