MAGNUM HAMMER SPRING .045" wire diameter

$6.50

 This .045 hammer spring fits all versions of the Magnum Adjuster for all airgun models. 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. A Magnum Adjuster is highly recommended when using this spring, it allows 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 may work better. 

 For full power, set the adjuster 2 turns back from full spring compression while the gun is cocked. This is the strongest setting that will work smooth for most. 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. 


Unmodified Discovery .22 starting at 2000 PSI with 14.3 grain lead pellets. Muzzle velocity in FPS (feet per second):

1)      888.1
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. Same 14.3 grain lead pellets as above.

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

 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.

1)    947.6

2)    952.9

3)    954.7

4)    956.5

5)    959.0

6)    955.8

7)    957.5

8)    952.7

9)    950.4

10)  954.2

11)  961.3   peak power

12)  958.2

13)  961.5

14)  958.8

15)  956.9

16)  954.0

17)  952.8

18)  954.8

19)  950.3

20)  947.9