I have always been a bit skeptical about those inserts. Don't get me wrong - they sound like a great idea, and from what I have been told, they work quite well. However, my concern is how long will they last? I would think that exposure to the elements - heat, cold, rain, snow, humidity, etc. - would cause the inserts to deteriorate, and thus allow a scope, over some period of time, to slip. Is this a legitimate concern?
Zachary