This M16A1 is in Excelect condidtion and has only had a few rounds fired through it. It comes with the original  A1 configuration parts, fixed butstock, and original triangal handgaurd upper and A1 hand grip.  So if you want to put it back you can!     You will also get the new sig piston driven 516 upper. A new Deadair SandmanS, in FDE, New aimpoint and mount. The old fixed butstock is replaces with a new carbine buffer tube and a Magpul six butstock, and new mag pull hand grip. This brings this old lower into the modern age.