Joe, I'm sure its not the pot and even if the firing valve was in poor condition you would do better than that. Take the barrel out and make sure the brass is still attached to it. Probably 2 grub screws on the top and a small one underneath. If its not, clean off the adhesive( like Loctite) and in...

I've removed the barrel cleaner everything out and replaced the seal and it's back up to 450fps, the breech is bang on centred now. is the pot the next place to go to gain another 100fps ish?

Has the barrel been taken out also breech seal carrier? Looking from under breech block is the transfer port fully open? I've just taken the barrel out to see if I can see anything unusual, the transfer port was slightly off to one side creating a slight bit of restriction but I wouldn't have thoug...

hi guys update time; took gun apart and firing valve looked alright so didn't order a new one. ordered new springs and changed them. I noticed the new firing spring was a little shorter than the old one so was wondering if someone had stretched the old one or something? it looked a little bent up. p...

Joe, mine is a 2002 version, possibly one of the first, and is pre anti tamper which I believe yours is. It has a firing pot, spring and valve just like the s410f. I think the hammer and spring are the same also. It's been a while since I had mine in bits so can't remember. I've hunted out the orig...

If it's a 2004 one, don't bother with the pot spring guide, it won't fit in the pot.
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perfect cheers Roger probably just the springs to replace then, could that really be all that's making it so low on power? that and 1mm on the pot?

after looking at an exploded drawing on the spares website I can only find the s410f superlight so not the same as mine but as good as, mine does not have the pot spring guide at all? I'm assuming its previously been tampered with and has gone missing. I'll be ordering one of them with all replaceme...

cheers Keith I'll give the barrel a clean now. I know the barrel seal O ring is good because I mucked up the first one and had to get a replacement. mine really likes accupel for accuracy so ideally I'd like to stay with them although I'll order a sample pack of the JSB's the firing valve could be t...

just using a chrono of Ebay, just tells speed then I've been working out the ft lbs. dont have heavier pellets to hand but I have lighter ones and they're only 30fps faster so still less ft lbs

I was under the impression of the further out the pot the higher the ft lbs to a certain extent?

I've got an old s410 carbine that's not seen too much use until I got it, the seals where shot so I've changed them and rebuilt the gun. after doing a bit of tinkering and after the advice on a Facebook forum I set out to work. I've pre tensioned the hammer spring by 1.44mm and cleaned the hammer ra...