[Flatlander]

In terms of replacing the glass, I don't think it will be easy. All of the electronics will have to be removed and it looks like that won't be easy! Also, I'm not sure if plexi glass will work (or just any glass for that matter). It appears that the lenses are epoxied in place as I couldn't see any mounting brackets. Also, the reticle is reflected off the rear glass and is projected on to the front one - changing the glass and even thickness means changing the physical properties and how the light bounces around in there so I think finding a suitable replacement might be difficult. This reflecting to projection process is probably the reason they had (and still do) have problems with ghosting (ie. getting multiple reflections from the inside and outside edge of the rear lense).