Discovery Hammer Bounce / Debouncer

Discovery Hammer Bounce / Debouncer

Joined: July 27th, 2005, 3:39 pm

July 12th, 2017, 9:53 pm #1

I have done several mods to my Discovery including a Magnum Airpower power adjuster, Challenger hammer and heavier hammer spring and have arrived at a nice compromise between power and shot count (21 shots within 4.1% of ES at 30 FPE using JSB 18.13 pellets). I do notice with this set up however that there is a fair amount of movement in the gun caused by the hammer release - enough movement to interfere when I am trying to do precision shooting. Is this caused by hammer bounce rather than just the hammer force and can I do anything about it that will not compromise the power level? Would the Freeflight Hammer Debounce kit help to reduce the 'recoil' from the hammer?

BTW I have the striker on the Challenger hammer recessed 1/16 inch from the hammer surface. Is this an optimal setting for performance / efficiency?
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Joined: October 14th, 2006, 12:30 am

July 12th, 2017, 10:31 pm #2

any chance the movement is caused by muzzle flip? Not sure if you could be getting the numbers you are if there was much hammer bounce, but someone else may know better -

HPA Sports used to sell a vented brake for the Discovery, and it did a great job of settling the shot cycle of my Disco -
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Joined: July 27th, 2005, 3:39 pm

July 12th, 2017, 10:52 pm #3

Muzzle flip - that's an interesting idea and I don't know. I do have a TKO ldc on my Disco and I have done the "bottle brush" de-pinger mod but I can't grock either of these causing the gun to move. It is not really dramatic but there is enough for the gun to be disturbed a tad during the shot...
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Joined: September 15th, 2000, 7:59 pm

July 13th, 2017, 6:57 am #4

I have done several mods to my Discovery including a Magnum Airpower power adjuster, Challenger hammer and heavier hammer spring and have arrived at a nice compromise between power and shot count (21 shots within 4.1% of ES at 30 FPE using JSB 18.13 pellets). I do notice with this set up however that there is a fair amount of movement in the gun caused by the hammer release - enough movement to interfere when I am trying to do precision shooting. Is this caused by hammer bounce rather than just the hammer force and can I do anything about it that will not compromise the power level? Would the Freeflight Hammer Debounce kit help to reduce the 'recoil' from the hammer?

BTW I have the striker on the Challenger hammer recessed 1/16 inch from the hammer surface. Is this an optimal setting for performance / efficiency?
When you come back to the Disco, you won't even notice it. Seriously, you're trying to battle physics. PCP airguns are NOT recoilless! Any time you launch a pellet downrange, you're going to get an equal and opposite reaction with the gun going backwards. When you shoot something like a 45 cal Quackenbush, it feels like shooting a .410 shotgun. It's not hammer bounce that you're having a problem with, it's the 30FPE that you're pushing downrange.
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Joined: May 12th, 2001, 1:29 pm

July 15th, 2017, 3:26 pm #5

I have done several mods to my Discovery including a Magnum Airpower power adjuster, Challenger hammer and heavier hammer spring and have arrived at a nice compromise between power and shot count (21 shots within 4.1% of ES at 30 FPE using JSB 18.13 pellets). I do notice with this set up however that there is a fair amount of movement in the gun caused by the hammer release - enough movement to interfere when I am trying to do precision shooting. Is this caused by hammer bounce rather than just the hammer force and can I do anything about it that will not compromise the power level? Would the Freeflight Hammer Debounce kit help to reduce the 'recoil' from the hammer?

BTW I have the striker on the Challenger hammer recessed 1/16 inch from the hammer surface. Is this an optimal setting for performance / efficiency?
The FFH doesn't decrease hammer momentum reaction, because it works by reducing the transfer of energy from hammerspring to hammer when the hammer rebounds from the spring.



The regenerative brake HDD, however, arrests the hammer earlier in the bounce cycle as it rebounds, not from the spring, but from the valve stem. So it does reduce hammer reaction -- by as much as 50% -- and so would help the effect you're bothered by.

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