Sig-Sauer Model R516 Gen2 Patrol, 5.56mm Nato cal. semi-auto carbine.  Serial #20F003051, mfg. USA.  New unfired in box.  16” barrel has mint bore, black military finish, adjustable gas valve.  Piston driven action.  Flat dark earth receiver, hand grips and collapsible stock.  Folding front and rear sights.  Four accessory rails.  In original box with one 30-round magazine, nylon carrying strap, trigger lock, rail covers, gun grease and instruction manuals.  Great dose of Homeland Security!