MAGNUM HAMMER SPRING for DISCOVERY & MAXIMUS .045" wire diameter
This is the Magnum Hammer Spring for Discovery, Maximus and 22XX PCP/HPA conversions. The ends are squared and ground flat to compress straight. It produces more power, better shot consistency and less hammer bounce. It's 1.5 " long and .045 wire diameter. It's intended for operating pressures of 2200+ PSI. The Magnum Adjusters I have listed for these models are highly recommended. They allow you to fine-tune spring tension for the best balance of performance, accuracy and efficiency. For pressure above 2200 PSI an adjuster may be necessary to produce high power levels and balance the shot string. For CO2 and pressures below 2200 PSI the .042" version I have listed for 22XX may work better.
For full power, set the adjuster 1.5-2 turns back from full spring compression while the gun is cocked. This is the strongest setting that will work smooth for most. Some will work well at 1 turn back, some won't. For the best efficiency, start with lower tension and increase in small increments until the desired performance is attained.
The more striker spring tension, the harder it is to pull the bolt back. It pulls easier with your finger hooked around the front of the handle close to the breech. It works smoothest done in one quick motion. More striker spring tension increases trigger pull. I have custom trigger groups and parts listed that reduce pull, increase comfort and improve accuracy.
The following chrony test results compare a standard Discovery .22 to one modified with a combination of this and other custom parts I have listed. Testing was stopped at 100 FPS below peak power. A .177 Maximus is tested after that with exceptional power and consistency.
The following tests were of a .177 Maximus with my upgrade valve screws to safely handle higher pressure. A magnum adjuster was installed and adjusted to 7 turns back from full spring compression while the gun is cocked. The Magnum Hammer Spring was the only other part needed to produce this level of performance. The starting pressure was 2250 PSI with 1800 left after 20 extremely consistent shots. Crosman Premier 10.5 grain domed lead pellets were used.
11) 961.3 peak power