is the exposed Fx Impact Bottle a concern?

The weight is minimal as the weight of the gun is more to the rear of the bottle there is a picatiny rail under the rifle for bipod or other accessory and the bottle its self is strong and threaded deep on the gun in my opinion there's no worry's there

I use to mess with high end paintball guns almost 10 years ago. Back then (and still today) they were powered on 4500psi carbon wrapped tanks pretty much exactly the same as what you see used on the FX Impact, Crown, etc. We were using 68 cubic inch carbon wrapped tanks which in the airgun world, is a very large and bulky tank. Here is a picture I found through Google search just to show you what that looks like. Notice that the air tank is only affixed to the paintball gun via the threads on the tank's valve. In play, these paintball guns can see a LOT of abuse as you're running & diving around, and it's usually the air tank that smacks the ground first. I use to be involved with R&D in the paintball industry, and I would say it was very rare for these tanks to fail at the neck under normal usage and reasonable amounts of abuse. The paintball industry standard of mounting tanks to the bottom of the pistol grip is a much worse design when you compare it to how airgun manufactures approach it. In general, people who use these paintball guns will on average put their equipment through much worse than what we do on our worst days as airgunners.

My opinion is that you don't need to worry about abnormal wear by holding the FX Impact by the bottle.

good point there, if its holding up on paintball guns is sure going to hold on a air rifle used for hunting and target work.

I own both 22 wildcat and 25 impact. The wildcat is a simple operatng, accurate rifle and can be bought around 1300. The Impact is an accurate ,finicky gun. Yes, its adjustable and it needs to be. It costs 2g! Im sure if i had it all to do over again, I'd buy 25 wildcat and for sure 22 wildcat