Author Topic: Reducing the spring pressure in my Break barrel air rifle.  (Read 203 times)

22_boomer

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Reducing the spring pressure in my Break barrel air rifle.
« on: September 04, 2020, 03:57:30 PM »
I bought a .177 Gamo whisper some years back when I was in better health but I am now a bit disabled and have a terrible time breaking the barrel on the Whisper. Is there a lighter spring I can get or can I modify the existing spring to allow me to cock the rifle. I can't afford to just buy another rifle and I don't need the existing power of the Whisper since I can only shoot in my back yard target range. The range is only 25 yards so I would imagine light spring power would be more than adequate.

Thanks,
Boomer


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rsterne

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Re: Reducing the spring pressure in my Break barrel air rifle.
« Reply #1 on: September 04, 2020, 04:19:23 PM »
The Canadian versions, which are under 500 fps, have a different piston that doesn't allow the barrel to come back as far when cocking it (stops at about 90 deg. to the compression tube).... That makes it easier to cock.... Other than that, you would need either a weaker spring, or perhaps shorten the one you have.... If you choose that route, only remove a bit at a time, you don't want the preload to go to zero and have the spring loose when uncocked....

Bob
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Alan

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Re: Reducing the spring pressure in my Break barrel air rifle.
« Reply #2 on: September 05, 2020, 04:18:06 AM »
If memory serves, the Whisper used a gas piston, which would negate the "shortening" of the spring, so to speak. Thus, I believe Bob's comment about the Canadian version is valid.
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Alan

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22_boomer

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Re: Reducing the spring pressure in my Break barrel air rifle.
« Reply #3 on: September 05, 2020, 05:33:32 AM »
This version of the Whisper requires the barrel to be pulled all the way down. I'll try taking it apart and see what makes it tick. If possible I'll try one coil at a time if it is a springer. If it is a gas type air rifle I'll have to just forget about it. I read someplace they require some type of tool to compress the gas piston plus there is nothing I could do about it's strength.
« Last Edit: September 05, 2020, 05:37:33 AM by 22_boomer »
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rsterne

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Re: Reducing the spring pressure in my Break barrel air rifle.
« Reply #4 on: September 05, 2020, 08:25:07 AM »
Sorry, I hadn't thought about the possibility of it being a Gas Ram....  :-[

If that is indeed the case, there is little you can do, because there is little difference in cocking effort between the beginning and end of the stroke.... This is because of the high pressure inside the ram when uncocked.... It isn't progressive like a spring.... it actually acts like a spring with huge preload....

Bob
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22_boomer

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Re: Reducing the spring pressure in my Break barrel air rifle.
« Reply #5 on: September 05, 2020, 09:20:48 AM »
I took the air rifle apart -- very easy for me. It is spring operated so I cut an inch of coils off the spring and put everything back together. It was easier to cock and could be what I could use except for the noise. The Whisper does not whisper and sounds like a small 22 rifle. That thing on the muzzle end is not a noise suppressor but a noise director and a hand grip. I tried to find an air rifle suppressor but the company I found doesn't make one for the Gamo rifles. Guess that will be my next project finding a company that does suppressors for Gamos.

The reason for my dislike for the noise is it bothers my dogs and sometimes annoys the neighbors. Due to disabilities my backyard is my shooting range.
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Capt45

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Re: Reducing the spring pressure in my Break barrel air rifle.
« Reply #6 on: September 05, 2020, 01:00:57 PM »
Do  you have to have a Fed Stamp for a Air Gun Suppressor?
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22_boomer

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Re: Reducing the spring pressure in my Break barrel air rifle.
« Reply #7 on: September 05, 2020, 01:26:44 PM »
I can't honestly answer that but I was told that the air rifle suppressors made here are not threaded and won't fit anything but an air rifle barrel. I've only found one place so far and they only make suppressors for the Crosman line of air rifles. I need to keep checking but I an going to try my Gamo on my range just to see how much difference there is in the point of impact. For an air rifle suppressor I would recommend contacting whichever company makes a unit for your rifle and see if you need a stamp.
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22_boomer

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Re: Reducing the spring pressure in my Break barrel air rifle.
« Reply #8 on: September 07, 2020, 07:33:29 AM »
The conclusion to this story is when I first tested after removing an inch of spring and reforming the end to a flat surface I shot the rifle with no pellet -- bad noise test. I later realized what I had done and use one of my Crosman .177' pellets and the only noise is the action of the spring unit being released. I am kind of deaf so I had my wife listen to the rifle and she said it just sounded like an electric staple gun being operated. My ability to cock the mechanism has be greatly increased with the removal of that section of spring so this may become my new backyard target range rifle. I need to locate the original Gamo scope and reinstall it and see how well this rifle shoots after being modified.

I tried to locate the weight of the .177" Crosman pellets that are the standard ones sold at Walmat but couldn't find any weight. The Gamo rifle originally came with some light weight pellets that gave the rifle the advertised higher velocity (something like 1250 fps) but I was not very excited with the accuracy. I hope my old decrepit brain can remember where I put the scope that came with the rifle since my eyes don't work well with the iron sights.

Besides cutting the spring to make it easier for an old man to cock the action I also wanted to cut the noise and both were accomplished. I didn't feel too bad about cutting the spring since as it was I could not use the air rifle and I discovered I could buy a replacement spring if I wanted to restore it to original.

This was a fun project,
Boomer

Edit to add: Couldn't find the original Gamo scope but had a small 3-9 power finger adjust OA type scope. I had some little adapters for the receiver grooves that converts them to Weaver type mounts and added the scope. I set up a target and first shot was 1" high and 1/2" to the right. The finger adjusters made fast work of getting it on the red dot target center. I can now actually operate the break barrel fairly easy now also. I need to remember to have my glasses so I can actually see the pellet when I'm putting it in the chamber.
« Last Edit: September 07, 2020, 10:30:58 AM by 22_boomer »
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rsterne

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Re: Reducing the spring pressure in my Break barrel air rifle.
« Reply #9 on: September 07, 2020, 09:41:07 PM »
Glad you got it shooting the way you want.... Congrats....

Bob
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22_boomer

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Re: Reducing the spring pressure in my Break barrel air rifle.
« Reply #10 on: September 09, 2020, 05:59:20 AM »
Thank you! It's really nice now and the scope is an OA type so I can focus it at my 25 yard range. I hated the flat black color so I got my wife to drive me to the local hardware store and got some brown spray paint to make the stock look at least something like a wood stock. The scope has the Mil dots so if I ever have a chance to shoot at a longer range I can use the dots to correct for longer distance. I don't know if I can say this here but originally I had built a single shot rifle for the range but the ammo just disappeared so the only excuse I had to get out went down the drain. I remembered I had the Gamo rifle but the health problems wouldn't allow me to cock it and if I did I was exhausted for just one shot. This springer may become my new backyard target range rifle. I may have to put some urethane on the finish since I can be a bit clumsy in walking and may bump the rifle and I'd hate to mess up the finish.
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