Following on from my earlier thread http://www.airgunbbs.com/showthread....urus-out-there, I have now got my new (to me) S400 up to scratch thanks to this forum (thanks again Chris, UKNeil et all). WIth the guidance it was a doddle.

Before stripping I noticed some blow back from the breech when firing so I replaced the breech seal.

Despite all being good in terms of performance, I am still getting the same amount of blow back through the new breech seal. Is this normal? If not, is there a tighter alternative or is it a new probe required?

As ever, I would appreciate words of wisdom.