Air arms s510 hammer spring?

[Redwolfpaul25]

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 

 

[Why]

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.

 

[wildcj5]

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

 

[Why]

Oh for sure he's gonna go to jail now...

 

[Redwolfpaul25]

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 

 

[Why]

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

 

[Redwolfpaul25]

Thanks why , i will give that a go 

 

[thumper]

 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.

 

[Redwolfpaul25]

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.

 

[chutesnreloads]

Old thread.
I have the opposite problem. With the rifle on the middle setting, I'm just over the 20 ft. lbs. allowed in field target. This with three best
pellets tested all 10.5- 10.65 grains. The JSB 13.43 put me even more over the limit. Can go to a lighter pellet but they're none tested so far
are as accurate.
Moving the power adjuster to next lowest setting puts me a lot slower than I want to go and gives a larger SD/velocity spread and less accurate
What to do?

 

[BSJ]

You could try different hammer springs.

Air Arms S300/S310/S410 Set of Four Hammer Springs

j Air Arms S300/S310/S410 Four different Strength hammer springs, ranging from low to strong strength. Photo is a general photo of Theoben hammer springs. The set here is for the S300/310/400/410 models, and are a bit larger than the photo. Always check the power to make sure the gun does not...

www.trrobb.com

Is your gun regulated?

 

[chutesnreloads]

You could try different hammer springs.

Air Arms S300/S310/S410 Set of Four Hammer Springs

j Air Arms S300/S310/S410 Four different Strength hammer springs, ranging from low to strong strength. Photo is a general photo of Theoben hammer springs. The set here is for the S300/310/400/410 models, and are a bit larger than the photo. Always check the power to make sure the gun does not...

www.trrobb.com

Is your gun regulated?

It is regulated

 

[chutesnreloads]

it's an S500

 

[BSJ]

You can try different springs or adjust the regulator down a little bit.

 

[chutesnreloads]

Is one preferred over the other? Aside from a little much speed it's shooting great

 

[BSJ]

The S5** platform doesn't have an adjustable hammer spring. Modifying/replacing the spring is the only option on that front.

The reg is adjustable, but there's the possibility you could over or under adjust it and throw things out of balance.

The quickest, most easily reversible, option is changing the spring and see what happens. You could buy a replacement "FAC" spring, cut half a coil off and see if that drops the power enough. Keep cutting till you get it where you want. If accuracy goes to crap, at least you can put the original spring back in.

Huma makes a drop in regulator. You could get one and play with its settings to see if it works for you. Leaving the original unmodified...

The S500 is not an easily tuneable system. You gota empty it every time you want to adjust the reg. No hammer spring adjuster too.

I went down the tuning rabbit hole with mine. At the bottom I found they shoot great right out of the box, and trying to "improve" it didn't really gain anything. Although, you can make things less good pretty easily...

 

[chutesnreloads]

Not trying to improve, I'm just over the power limit for field target.
Only need it reduced one ft. lb.

 

[terrykuz]

I have a new regulated a510 that had a leak at the transport seal. The seal is a nylon gasket that seats in the port.

Anyway the 4 screws that hold the receiver halves together were not tight, hence the bleed off. ( in older rifles I think the "transport gasket" may have been a o-ring?, that is what I saw in a youtube)

I guess the guy that built my rifle forgot to torque down those screws. It was pretty loose. I could only get 600 FPS max when the screws were loose. I tightened those screws, and my velocity went up on all ranges. Very consistent now, with range regulation of about 400fpe to 990 FSP with 9G 177 pellets. Dial range = 400, 730,859,958,991 average.

It was a big deal to me, but it turns out it was an easy fix.

As a PS, the youtube video said the screws were all 2.5mm. On my new rifle two were 2.5, and other 2 were 3mm. That freaked me out because I thought the larger ones were stripped. So that added to the drama. LOL.

Good luck.