I think this would be a great way for the uninformed to screw around. I can see guys who have no experience sending things back, with only a dead battery (or one that isn't fully charged).
You'll get noods saying "It hooks left, and thats a cybergun they should work perfect".
Now if we really wanted to get better service I think our gun docs should have access to better training, tools and parts. I think my upgrades would be about 40% of my guns cost, so about standard for warranty.