That appears to be a MK12 Mod H and a Bushnell SMRS and to my knowledge was never a spec MK12 optic. It’s likely either a personal optic or a small unit that could procure whatever they wanted. Spec optic is a MK4.
I don’t get the ideology behind something being clone correct because someone put their personal optic on a rifle and fielded it. At that point just put whatever you want on your rifle and call it a clone.