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Hi Johnny, yes sir, this will fit on your Ruger AR rifle. Stay safe & have a great day!

yes it will mount on the Ruger picatinny rail "The USS GEN3 scopes are equipped with a Quick Release Mount with an Auto-Locking Latch. To mount the scope to a Weaver/ Picatinny/ MIL-STD 1913 type rail, move the Auto-Locking Latch located within the Quick Release Lever away from the pivot point and swing the Quick Release Lever to the forward (Open) position. Place the Quick Release Mount onto the optics rail, with the Recoil Lug placed into one of the cross slots on the optics rail. Move the Quick Release Lever rearward (Closed position) to secure/tighten the Quick Release Mount to the optics rail."

Hi Johnny and welcome. This will fit no issue on the Ruger 556. Optimal placement on rifle in picture 4 here: https://www.evike.com/products/88621/ ----------- Cheers, stay safe and enjoy!