I have to agree that where to discuss that particular accessory has always been a gray area. My thinking is that it goes equally well in either Rifles, Gear and Accessories, or General Handguns (for handgun specific scopes such as EER's).
In general, we will leave the thread where it lands if it is in one of those forums. Rarely, if ever, would it be appropriate as the main topic in a General Discussion thread.
Strictly in my opinion, questions and discussions about a scope specific to a certain rifle fit best in the Rifle forum. I view them as an integrated system.