AE Swede AirVenturi Avenger dual regulator/bottle setup with regulator adapter and block off for upper tube.
This kit is machined from 7075 high strength aluminum. It adds an upstream regulator (not included) to the Avenger which is fit to an air tank of your choice. This dual regulator setup is what some high end airguns use and generally provide tighter shot speed windows. My own Avenger .25 shoots a slug at 1029 FPS (highly modified) every single time. When properly setup this will provide ultra low SD's and take a lot of stress off of the stock Avenger regulator as it will only see the regulated pressure instead of a full 4500 PSI.
This includes a regulator adapter and a plug for the upper tube location. You will need to purchase a paint ball style regulator which is set 300 - 1000 PSI higher than your set pressure on your stock Avenger regulator.
Hajimoto is the man to talk to for a ninja regulator. He will set it to your needed pressure up to 2,800 PSI. Do not use Ninja regulators for output pressures above 2,800 PSI
Here is an eBay listing for a multiple output pressure choice regulator. I'll try to these in house as soon as possible so that the entire kit can be ordered all at once.
Do Not Use Air Ninja regulators for output pressures above 2,800 PSI. There are not enough threads on the bonnet to hold pressures over 2,800 PSI safely.
Chinese regulators have 2 extra threads and can hold to 3,000 PSI output pressure safely.