Lyndell, yes the Ruger 5.56 is a mil-spec designed rifle. The mil-spec buffer tube, Ruger has equipped the AR-556 with a six-position adjustable stock. The trigger is a single stage mil-spec trigger as well.

Lyndell, Yes the model 8500 Ruger 556 is milspec and can take all milspec AR parts you want to replace.

YES, Ruger 556 will take mil spec parts with no issue. I hope this helps

It does have a mil-spec buffer.

Yes, the Ruger 556 will accept milspec parts and accessories.