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PostPosted: Tue Oct 24, 2017 12:08 pm 
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Joined: Fri Dec 14, 2007 3:10 pm
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Location: Central BC
I’ve got several spring guns, and I was looking to reduce the power in one to allow for quieter, less powerful shooting indoors over winter. If the gun already has a weaker spring (not an HO) can I reduce power further by simply cutting a coil or two off of the mainspring? I realize I should then be grinding the end flat and polishing it. I also understand this would be a permanent mod and would need to swap out for a more powerful spring if I wanted to bring the power back up. I’m just curious if I could have potential problems with a slightly shorter spring, like maybe the sear not engaging or something.
Thank you for any help.

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PostPosted: Tue Oct 24, 2017 12:10 pm 
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Yeah you can cut it more, and if you cut it too short. Can add a spacer.


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PostPosted: Tue Oct 24, 2017 1:54 pm 
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Location: Thunder Bay,On.
When you cut down a low power spring you will find it gets real twangy when you shoot.....The good part is you won't need a spring compressor for reassembly...you'll be able to push the spring in with your thumb. I think you will also want to sleeve the piston because of the reduction of spring tension tends to allow the spring to rattle much more...I think switching to heavy pellets would be a better option....like 11 or 12 grain...which give a quieter "thud"sound to your gun....

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PostPosted: Tue Oct 24, 2017 3:09 pm 
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Joined: Fri Jan 25, 2013 9:51 pm
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Location: Dryden, Ontario
I cut a low power spring down 2 coils and the gun shot slower for sure but it sounded junky, like it was going to fall apart.So I put spacers in to bring it back to where it was :oops: I never thought of sleeving the piston.Never did that before so another project on the way. :D


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PostPosted: Tue Oct 24, 2017 7:51 pm 
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Location: Central BC
MyCrosman wrote:
When you cut down a low power spring you will find it gets real twangy when you shoot.....The good part is you won't need a spring compressor for reassembly...you'll be able to push the spring in with your thumb. I think you will also want to sleeve the piston because of the reduction of spring tension tends to allow the spring to rattle much more...I think switching to heavy pellets would be a better option....like 11 or 12 grain...which give a quieter "thud"sound to your gun....



Good suggestions thanks... I’ll try the heavy pellets first to see what that does to start.

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Highlights - Evanix Conquest
FAS6004, HW44, Alfa Proj
AA S200, AA ProSport, HW77SE, HW30s
FWB 300S, FX Dreamline FT, Hammerli AR20
Other goodies!


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PostPosted: Sun Oct 29, 2017 7:36 pm 
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If it's a B18 or similar like a generic Crosman break barrel you can shorten the spacer instead. If not then yes you can cut the spring but to get back to full power you'd need to buy another so I'd consider keeping your full (or normal) power spring and buying an already weaker spring to cut up. It won't hurt anything but for min noise it's best to make sure it fits the guide well and/or make a plastic piston liner to dampen twang.
There was one guy here that cut his spring down so far it was loose inside, shorter than zero preload, and it still worked well. I think it was on a Slavia? I think he posted velocity as he cut it down but it's been a long time so I barely remember the post.


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PostPosted: Sun Oct 29, 2017 9:55 pm 
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Chevota wrote:
If it's a B18 or similar like a generic Crosman break barrel you can shorten the spacer instead. If not then yes you can cut the spring but to get back to full power you'd need to buy another so I'd consider keeping your full (or normal) power spring and buying an already weaker spring to cut up. It won't hurt anything but for min noise it's best to make sure it fits the guide well and/or make a plastic piston liner to dampen twang.
There was one guy here that cut his spring down so far it was loose inside, shorter than zero preload, and it still worked well. I think it was on a Slavia? I think he posted velocity as he cut it down but it's been a long time so I barely remember the post.


Interesting, thanks. I was considering doing this on either my hw57 or tx200. Both are just a little too loud for indoor shooting without disturbing the little one. I’d love to be able to use one inside. I actually recently picked up a 10j vortek for my hw50s thinking I would be reducing the power but instead it has increased the power and notably the cocking effort. It was a 495ft shooter before which I think equates to around 8-9 joules with average pellets. It’s no longer as indoor friendly. I may swap the kit out yet but still hope to use one of the other guns as well.

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Highlights - Evanix Conquest
FAS6004, HW44, Alfa Proj
AA S200, AA ProSport, HW77SE, HW30s
FWB 300S, FX Dreamline FT, Hammerli AR20
Other goodies!


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PostPosted: Mon Oct 30, 2017 6:54 am 
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Joined: Mon Mar 27, 2017 7:06 pm
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Location: Meaford, Ont.
Just a thought is buy a P17. Super quiet for indoor shooting and save the louder guns for when wife goes shopping or visiting. Then you stay home and shoot. :D I bought a Princess Auto $49.99 break barrel and it shot good but sounded junkie with the high twang. I added a piece of 3/4 inch PVC pipe before the spring as a spacer and now just a deep thud. It is quiet and shoots as good as my more expensive guns at 30 feet.

I do know one thing for sure is shooting pellets in the house everyday sure improves your shooting of powder burners out at gun range. Ten years of bow only but I have been getting into my powder burners lately and I can say I have never shot so well in 50 years of shooting rifles. I know for sure it is from shooting pellets. Each time I leave I walk away in awe at my 100 yard targets with my powder burners.

Good luck to you. CHEERS!


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