Ruger SR-556 Piston AR-15 556 Rifle.

This is a legendary classic premium AR. One of the first and best piston operated. Cold hammer forged fluted barrel. 3 setting adjustable gas block. Chrome BCG. Flip up iron sights. Shoots excellent. This is the takedown version which can easily be dissassembled. Comes with case and mag. Has not been shot much. Thoroughly cleaned and lubed. MSRP was $2,000 10 years ago.