Air Arms Owners Club

Hi everyone, I am after some help please. I have a mk1 s410 I bought in january. It took me just 20 minutes to zero it in and I was getting groups of ten pellets in a group just under 5p piece size. I took it out a couple of times and had some pigeons and crows and everything was fine. Checked the zero again 4 weeks ago and it was off. It doesnt seem to group properly now. Ive been trying to sort it for the last 4 weekends but just cant work out whats wrong or what im doing wrong. Cant even get a decent group to zero it. Ive tried loosening and retightening barrel bands and made sure pellets arent clipping silencer. I did go through a short phase of not locking the bolt down properly and someome said I may have blown breech seal? Any help greatly appreciated as I am really annoyed as I cant get to the bottom of it. Many thanks

Sounds like it might need a pull through or use VFG cleaning pellets. Rog

put some tissue paper over the breech and fire it see if it blows the paper off .
Julian is the man to message for advice and spares . bgltd on here .