The AR18 was an alternative design to the AR15. It was designed by Armalite, Eugene Stoner, but never went into military service. However it was used as a starting point for builds by other countries like the SA80 or the SAR80. This weapon comes with the original ArmaLite scope, these are harder to find for sale. In great condition, it is on a form 4 in Florida and will transfer to your dealer. Comes with one mag.