I know see your edit, but I would like to put out justification for why that isn't a problem if anyone else is having those same concerns.
1st. Would Companies like FX or Daystate sell guns where your front hand was designed to rest on the bottle if it was a problem? That's the simple justification that the Impact would have a rail or something on the bottom of it to take "stress" off of the bottle if this actually was a problem. FX also sells air tube clamps that are a similar principle to what I'm selling except their are medal and $70 plus shipping. I would have gone that route if they weren't so expensive.
2nd reasoning. Think about the amount of pressure that is on the threads of an air tube. These threads have to hold back a 3000 POUNDS per SQUARE Inch of air from launching a rocket at someones face. For simple math were are going to say that the threads cover exactly 1 square inch and are 1cm depth. This would mean that if the gun weighed 10 pounds and you moved the force away from the threads 20cm (about as far as you would probably want this picatinny mount) then you would have 10lbs (weight of gun) multiplied by 20 because the force on the threads will be multiplied the further out you go. This would mean that an extra 200 pounds of force are going onto the threads when compared to the threads on their self. If the gun is already filled to 3000psi then how much more dangerous would it be to fill the gun to 3200psi? That is the same amount of force being added to the threads. No one would have hesitation if they accidentally filled their gun up an extra 200psi. Well...maybe someone would have a problem, but most likely not most of us.
I do not claim to be an engineer and I am assuming a lot of things in that mathematical equation, but hopefully you will get the point. Yes their is added stress, but it's not any more significant than the extra stress that you are putting on your cars suspension when comparing the vehicle moving to a vehicle moving with a person inside.