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This listing complies with 's air gun guidelines found here and I will only sell and ship air guns to buyers in jurisdictions where permitted by applicable laws - listing is for the 360 BRASS POWER ADJUSTER shown in the main photo, other parts shown for reference only.
FITS THE CURRENT CHINESE-MADE AND OLDER USA-MADE MODELS, MUST USE 8-32 SCREWS, INCLUDES 8-32 BUTTON HEAD SOCKET SCREWS
INSTRUCTIONS POSTED FURTHER DOWN PAGE AFTER DESCRIPTION
This is the newest version of our MAGNUM POWER ADJUSTER for 22XX machined from 360 brass. It has a locking collar and tick marks on the back of the knob to help gauge and maintain adjustments. Paint can be used to fill one or more of the notches to help keep track of adjustments, full and partial turns are easy to count and return to, black paint was added to the one in the second photo, it can be seen at the top position. The hammer spring can be removed by backing the adjuster knob all the way out. The adjustment range is wide enough to produce maximum power, maximum shot count or any level of performance in between. It works with all of the hammer springs we have listed. It fits 1740, 2240, 2240XL, 2300T, 2300S, 2300KT, 2400KT and 2250.
It allows you to get more power when you need it or more shots when power is not critical. At 70 degrees F, adjusted to the minimum power level where it will shoot consistently and reliably, it produces about 175 shots from a 12 gram CO2 cartridge. At full-power you get 20-25 shots if it's adjusted correctly. Anything less than 20-25 shots per cartridge and it's either too cold or the adjuster is set too strong and wasting CO2 without producing more power. Minimum power is generally 250-350 FPS depending on barrel length and the temperature of the shooting environment. Maximum power is generally 525-650 FPS with longer barrels producing the higher numbers. In hot temps even more power can be produced because CO2 increases in pressure as it gets hotter. Using more striker spring tension reduces shot count but produces more power up to a certain point, too much tension can waste CO2 without producing extra power, so the goal if going for maximum power is to find the sweet spot where the velocity peaks, which when using CO2 is NOT with the hammer spring adjusted as tight as it will go, in many cases it's much less hammer spring tension than that.
INSTALLATION & ADJUSTMENT
MAKE SURE GUN IS UNLOADED, UNCOCKED AND EMPTY OF PRESSURE BEFORE REMOVING OR INSTALLING PARTS
Chinese-made models have mounting screws that are M4 thread for the factory tube plug, this adjuster requires 8-32 thread mounting screws. Button-head screws are included, they fit a 3/32 hex-drive bit or Allen wrench. Use the longest 7/8" screw if you have a plastic breech, the shorter 3/4" screw if you have a steel breech, the shortest screw is 5/16" and it's for the rear of the trigger frame. These screw lengths are critical, using longer screws will damage the threads of the adjustment knob.
1 ) Remove the rear trigger frame and rear breech screws. Remove the tube plug which is where the adjuster will mount. It usually falls or lightly ejects out if you don't hold it while removing the screws.
Install the adjuster with the threaded knob removed. Install the mounting screws, don't tighten either until both are fully threaded in.
Place the hammer spring on the guide at the tip of the threaded adjuster knob. Make sure the spring goes into the back of the hammer as you thread the knob into the tube plug.
If you adjust the knob too far forward, the hammer will not pull back far enough to catch on the sear. Adjust to full spring compression with the gun cocked, stop when you feel the spring is fully compressed, do not force it further. Back the adjuster out two full turns, this is about the tightest setting that works smoothly. This would be the full-power setting for high-pressure PCP and HPA guns. For lower pressures and CO2 the spring tension may need to be lighter for the power level to peak. If too much spring tension is used at low pressure the valve will tend to close faster causing power loss. This is very common with CO2 models, especially at low temperatures where CO2 produces less pressure.
2 ) With a power adjuster, custom valve or stronger hammer spring it’s typical to have to lock the bolt back to get the valve to seal so it can be pressurized, so you should do so before installing a new CO2 cartridge. For bulk-fill, PCP and HPA this isn't necessary if there’s pressure left before filling.
3 ) The more striker spring tension you have the harder it becomes to pull back the bolt. With a power adjuster, especially if using a stronger hammer spring, the bolt will pull back easier with your finger hooked around the front of the handle close to the breech. If done in one quick motion the bolt will pull back smoothly. If done slow or holding the handle further away from the breech the bolt may tend to bind or work rough.
