MAGNUM HAMMER SPRING

$6.50

 This listing is for one Magnum Hammer Spring, brass Magnum Adjuster shown for reference only. 

 This is the Magnum Hammer Spring. It's a perfect fit for Discovery, Maximus and 22XX PCP/HPA conversions. The ends are squared and ground flat to compress straight. It's about 1-5/8" long and .047 wire diameter. It's hard-hitting and intended for operating pressures of 2000+ PSI. With one of the power adjusters I have listed it works well up to 3200 PSI. An adjuster is highly recommended, it allows you to fine-tune spring tension for the best balance of performance, accuracy and efficiency.

 For full power, set the adjuster 1.25 turns back from full spring compression while the gun is cocked. This is the strongest setting that will work smooth for most guns. 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.

 The following chrony test results compare a standard Discovery .22 to one modified with a combination of this and other custom parts I offer. 14.3 Grain pellets were used for both tests. Testing was stopped at 100 FPS below peak power. 


Unmodified Discovery .22 starting at 2000 PSI :

1)      888.1   muzzle velocity in FPS (feet per second)
2)      901.0   peak power
3)      899.8
4)      878.8
5)      877.7
6)      871.5
7)      855.6
8)      854.9
9)      849.6
10)    843.0
11)    837.1
12)    836.0
13)    827.6
14)    819..7
15)    813.4
16)    797.1   100+ FPS below peak power

.22 Discovery with custom valve screws, Magnum Adjuster, wide-bore gauge port (or bypass cap), 26" Maximus barrel and a starting pressure of 3200 PSI. 

1)     958.8
2)     965.9
3)     971.2
4)     973.4
5)     977.2
6)     978.9
7)     984.5
8)     991.6
9)     994.7
10)   989.3
11)   997.6
12)   1000
13)   1007
14)   1002
15)   1005
16)   1009   peak power
17)   998.8
18)   1002
19)   990.1
20)   982.7
21)   977.8
22)   965.2
23)   958.3
24)   949.4
25)   938.3
26)   918.7
27)   907.6   100+ FPS below peak power