a4 sporter?

[ed skeels]

If I remember correctly in Vietnam they put the scopes in "hot boxes" to defog them. Probably a box with a light bulb in it. Also held captive spiders to get filament for the crosshairs. Obviously before inert gas and proper sized wire. I'm thinking that was in Major Plasters Sniper book.
Deer hunter's would leave their rifles outside to keep the temperature change from fogging up their scopes.
Ed