Air arms s510 hammer spring?

Forums PCP Airguns Air arms s510 hammer spring?

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    Redwolfpaul25
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    Hi all.

    I am wondering how much of a job it is to increase the power slightly ( only talking a couple foot pounds) on a  uk air arms s510  carbine as i have found it shoots wonderfully  with 13g prohunter slugs but its slightly underpowered ( 9.5 ftlbs )  ive looked on youtube and the like to see if i can get some info but to no avail 

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    Why
    Participant
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    Go use a coin or maybe even 2 that fits or go to your local hardware store buy some washers maybe 2 that you can use to shim your hammer spring try one first angle CHRONY and please don't blame me if you end up going to jail.

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    wildcj5
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    On my S400 MPR it went from 6ftlbs to 12 by opening the transfer port restriction screw, not sure if the 510 has one, and adding one 90 durometer oring on the spring guide. The instructions below show to cut a piece of copper but this was to large and my rifle wouldn’t engage the trigger.

    http://www.airguns.net/general_aa_mpr_power_upgrade.php

     

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    Why
    Participant
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    Oh for sure he's gonna go to jail now…

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    Redwolfpaul25
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    Thanks for your concern why about me maybe going to jail but i do know the law in my country ..i was hoping that someone has done this with a s510 as the mpr is a different action, theres plenty of info about doing it to a s410 and other models but nothing relating to a actual s510 

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    Why
    Participant
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    For your slight bump up in power you want, that is the best I can offer. Shim that hammer spring.

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    Redwolfpaul25
    Participant
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    Thanks why , i will give that a go 

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    thumper
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     I would check to see where the transfer port is set first. It's likely fairly restricted. You may could just open it and get the increase you want, without any change to your starting fill pressure or power curve. Since this is basically the only simple adjustment on the rifle, its most likely how the factory sets the power when they build it. Hopefully yours is easily adjustable and not anti-tampered somehow. 

    Here's a link to a Huma regulator instruction guide, it show how the gun comes apart and good pics of how the transfer port was adjusted. Mostly closed in this rifle's case: 

    http://foto.huma-air.com/foto/installation%20guide%20Air%20Arm%204xx-5xx%20made%20by%20Coverleaf%20from%20Airgunforum.pdf

    IMO the hammer spring is NOT what you need to adjust. Take for an example the FAC guns with the power wheel. All it is is a variable diameter transfer port and it will take the rifle from very low power to 30fpe with the turn of the dial. Most importantly, it does this without altering starting fill pressures or power curve. They also have a LOT of hammer strike, too much really, and I would imagine the 12fpe guns are setup the same way. I think the transfer port adjustment would give as much power as you needed easily. Especially if it is mostly closed like in the Huma guide.

     

    • This reply was modified 5 days ago by thumper.
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    Redwolfpaul25
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    thanks for the detailed response once I get a chance I will follow the instructions that you kindly sent to me and see what I can do.

    the power of my gun is normally a acceptable11.2ftlbs with 15g H&N sniper magnums but since I started using these 13g slugs because they engage the rifling more there is a obvious reduction in power, normally I would just change to different pellets but these slugs are very accurate in lots of wind due to there better bc and I would much prefer them.

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