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Message: <blockquote data-quote="etudiant" data-source="post: 3595120" data-attributes="member: 48052">Hi Henning,Sorry about the slow response, was out of internet contact for a week.Nikon USA seems to have a policy that serial numbers are confidential.My ED50 has none that I can find, but as a consolation prize, there is a very clear 'Made in China' on the foot, which incidentally does have the metal screw thread insert.Sgt Abbot, my old range master, would be pleased to know that his emphasis on using the sling remains valid. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />Vortex is clearly trying to make scopes more user friendly. A mounting rail makes sense, but I suspect there was stiff opposition from the marketing people who like to emphasize light weight. The prospects for a Nikon sponsored ED50 red dot sight are nil, unfortunately, as Nikon is not making money in sport optics afaik. Consequently development money is scant.               It will be up to dedicated amateurs to indicate the way forward. The mounting is the hard part. The eyepiece fitting is probably the most exactly measured part of the scope, so clipping the sight on that part might be the way to achieve the 'plug and play' capability that is desired.</blockquote>