Did you remember to take your lens covers off? Did you turn your optic on? What setting? You did, great! Now you come out of your climate controlled house into the damp morning and viola', the optic is fogged up.
pangris, you're making your own pistols now? Like how a Jedi has to make his own light saber?
I don't see any reason for the adjustable stock - but it shouldn't hinder you unless it breaks, you forget to extend it, etc etc.