Had you considered getting this appraised?
With the markings, this is in all likelihood the KSC version of the Glock 18C. It's not a bad replica but you may want to evaluate your pricing as this is well above its market rate given its condition (scuffs on the side and the missing front sight post) and the lack of a magazine. As you haven't fired it, a buyer may want some assurance it is still functional.
Does the trigger at least operate?
With the markings, this is in all likelihood the KSC version of the Glock 18C. It's not a bad replica but you may want to evaluate your pricing as this is well above its market rate given its condition (scuffs on the side and the missing front sight post) and the lack of a magazine. As you haven't fired it, a buyer may want some assurance it is still functional.
Does the trigger at least operate?