![]() Anybody who has used these optics in less than acceptable climate conditions know they can and do fog, this is why. And change in temperature or adjustment of the eyepiece both create an atmospheric pressure change inside the optic creating either pressure or a slight vacuum. The eyepiece focus adjustment is not and cannot be sealed effectively thus making the optic unsealed. The MST-100 optics by design, are not Nitrogen purged and sealed. If there was enough interest we could produce etched football reticles as well as the true mildot. The dots are a cleaner round shape rather than the inconsistent football-ish shapes made by dripping resin onto the wire. The glass etched reticle takes this to the modern era with no discernable optical difference with the exception of perfection in spacing of the bars and dots to a true mildot. It is amazing what John Unertl was able to accomplish when he designed and built these scopes creating the first Mildot scope, with the resin dots on the tungsten wire, perfectly spaced to create the Mildot reticle, amazing craftsmanship that is extremely difficult to replicate. All of these old scopes are just waiting for the tungsten reticle wire to fail rendering the scope useless. If you own a USMC MST-100 from an M40a1 or the Canadian C3A1 MST-100M scope you will understand why the glass etched reticle is a great idea. Available only through Sentinel Tactical is a glass etched reticle retrofit for the USMC UNERTL MST-100 & MST-100M.
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