Saber tactical bottle clamp

Why not just use the extension of the trigger guard that's already provided? I use it on both of my Impacts and it works like a charm.

Regarding the clamp on the high pressure bottle, though, I wouldn't worry about it. In fact, I may very well put one on my newly acquired Daystate Wolverine. Remember, most of these airguns are meant to be outdoor tools that can withstand the rigors of hunting. The very small stress that the clamp may impart to the bottle will, I believe, be negligible.
 
I used a bottle clamp with zero issues on my Red Wolf. I don’t believe there should be a worry about pressure on the bottle. Look how many of these rifles are made with no protection under the bottle and they know many people shoot off bags and sticks. I think if there were issues, then manufacturers would put things in place to limit their liability.

You could also try a pic rail extender. Won’t get out as far, but would be the cheapest option. CCut has a picture of one in his Delta Wolf post from last night.