Just as a follow-up, it was indeed the end O ring in the cylinder - finally managed to get the cylinder end off with the help of that valve tool from XTX (Christ it was still stuck on tight though! A soft-headed vice, large spanner and a lot of swearing were finally needed to get it out!) and replac...

Thanks Rog, here's the link https://www.xtxair.com/air-arms-s400-s4 ... valve-tool

Just watched the video too here: https://www.youtube.com/watch?t=&v=-wP6YXXEsPg, which was useful.

Looking at the parts diagram, the end (S491) looks like it screws right off, but I'll be blowed if I can hand turn it.

Hmm, Any idea how I get to it? I've got this far, but not sure how to get the end off the cylinder? Is it just an allen key in those holes below to take that end off?



Or is it more involved?

Cheers Rog. Yea, judging by the state of the others I changed when they came out it will be. I'll give that a try.

One day I'll have them all changed. One day.

Hi all, I recently (well, a couple of months ago) replaced the seals on the filling adapter for my S410 FAC. This included taking the actual valve out and replacing the small S327 o-ring. Seemed to all work fine at the time and shot well, held pressure. Skip forward to today, and I took it out this ...

Yea, that's what I've ended up doing. I just wondered if anyone else had had any experience with these pellets in a FAC S410 and had any joy? I've seen better groupings with my Browning O/U.

Anyone used these H&N Rabbit Magnums with an S410 FAC (in .22) and managed to get them accurate in the slightest? Bloke in the gun shop got me to buy a tin because they're 24gr and won't deform (using JSB Heavies normally) but I'll be blowed if I can get these to group in the slightest. I mean, ...

Thanks BBF, I'll have a little play around and see if the bunnies on my land get startled without the mod.

Hi all, Recently purchased an Air Arms S410 Xtra FAC, .22, standard barrel. I've got a slot on my FAC for a mod and was debating which one to get, The Air Arms one just simply screws into the barrel, however, a Weihrauch mod (1/2" UNF) would need an adaptor. So, two questions really: 1) Is the ...