It will work without the top sear spring but it might be a bit sluggish, the spring helps the top sear to disengage from the hammer, if you have a trigger that is over lubed it might not even disengage when you pull the trigger, and if you have a pellet in there! Rog

XTX is the fella for the tool that you need, they can be a real sod to undo. Raj done a guide about getting the ends off, it's on the Altaros website, well worth a look. Rog. Just had a look at Altaros dosnt seem to be there any more, Raj will probably explain it to you

Raj, Thanks for that , I thought there probably shouldn't be air escaping there! I did initially think it was coming from the breech area as the oring on the bolt was missing, but I fitted a new oring from a kit and I hope its the right size , is there one size for .177 and.22 or are they different...

Could be the power adjusting screw, they can turn themselves in and reduce the power sometimes, I have seen this happen on a couple of S510s at my club, they start off high and slowly reduce in power, just like you are experiencing. Rog

How long is a piece of string mate, they don't seem to come cheap, standard walnut £300+ and thumb hole about £400+ custom stocks do CS500 for £185 and CS700 thumbhole for £210 they are nice stocks, I have two of them, one on my HW80 and the other on an HW95. The A/A ones ain't cheap?

Take the action out of the stock one bolt, take side plate off trigger 2 screws, lift the plate off, push top sear up, and it will appear cocked, no need to de-gas, you will see exactly how it works. Rog Terrific! Thanks very much Roger. Oh wait a minute... you're saying that way I will "see e...

Take the action out of the stock one bolt, take side plate off trigger 2 screws, lift the plate off, push top sear up, and it will appear cocked, no need to de-gas, you will see exactly how it works. Rog

I am more than happy with my 9~13 but they do a 6-9 which might be better for benchrest, just make sure you get one that swivels, and yes it will fit QD stud, I have one on an ultimate stock and another on an MPR both work ok. Rog

You need a QD stud from Rowanengineering.com, and it's just an accessory rail. Any bipod should fit on QD stud, I use a Harris 9-13 the one that tilts. Rog

Blackcat68 wrote:Do I need to give it a blast de cocked as ive read that there xould be some shit in the valve.then cock it to fill.

Cock it, or the hammer will keep firing valve from shutting. Rog