Gamo bull whisper weak


November 24, 2013, 07:33 PM
I bought a used gamo bulk whisper bone collector 177 cal air rifle used. Seems to be in ok shape. It's soo weak it won't punch a beer can past 50 feet. It's rates for 1,300 fps with pba ammo. I tried to google rebuilding them. But found nothing. I've never own a air rifle. So I'm totally clueless on anything about them.

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November 24, 2013, 08:21 PM
If there's noise/scrunching sounds when cocking the gun then the spring is probably damaged or broken.

If not, the odds are that the seal is gone. If that's the case, it would probably be best to stop shooting it until you get it repaired. The lack of resistance means that the piston is ramming into the end of the chamber at full speed which will eventually damage something.

Disassembling high-power spring-piston airguns is potentially very dangerous since the springs have enough stored energy to be lethal. Gamo may have a warranty/repair program. If not, they may be able to recommend someone who does repairs.

November 24, 2013, 10:05 PM
Being new to airguns, did you by chance leave the rifle cocked when you last shot it? Or maybe the previous owner? Spring piston airguns cannot remain cocked for a long period of time before shots or spring damage can occur.

November 25, 2013, 04:54 AM
Chicken farmer, no, i dont leave it in the cocked position. Im not sure about the previous owner.

There is no noise like that when i cock it. Its smooth and quite.

November 25, 2013, 12:01 PM
Sounds like your piston is allowing air to blow by. Either the piston is damaged or leaking. I would contact Gamo if its still under warranty, or look on YouTube to take the rifle apart yourself. Just be extremely careful because as previously stated that main spring is no joke. Under pretty good tension.


November 28, 2013, 01:32 PM
Look into the breech seal being damaged too. That is the seal that covers the hole that the pellet goes into.

December 1, 2013, 06:52 PM
I assume it is a nitro spring gun? Nitro springs have a high failure rate from leaking out over time, so if it's a nitro then I'd say 90% chance that's the problem. It's easy to determine by cocking effort, if it takes about 30lbs to cock it then it's probably fine, if less then it has leaked by a similar amount. Judging by the power you described I'd say it'll be less than 10lbs to cock, if that is the problem.
If that's fine then I'd check the breech seal to see if it's leaking, or possibly missing. The main seals usually leak but that much would be very abnormal. I'd consider buying new main and breech seals for it regardless. You should also check the bore for rust and transfer port for rust or obstructions. If you need to take the gun apart then I can't say not to use a spring compressor, but I will say I have never needed one.
Usually Crosman parts can be used, but Gamo parts vary here and there so I can't say for sure. I use Crosman when I can because their parts are usually much cheaper than anyone else. For example the main and breech seals are only $1.15 ea, a main coil spring is <$6, a nitro spring is $26. Shipping is a flat $4 per order. You can write me at chevota at hotmail if you have questions. I also have a nice tuning guide and trigger guide if you want to tune the gun while it's apart.

December 6, 2013, 02:36 PM
GAMO are not very good quality guns. There is a guy that can repair them, Mike at Flying Dragon out of Iowa. There are others as well. Just about any brand has better function and realiability than a GAMO. Chinese guns sold by name brand gun companies are better. The velocity claims as well as noise claims are totally bogus for GAMO as well.

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