well I don't own your rifle but I Google it and you are not allow so here is that page
there might be an answer in all of the posts but the ones I had time to read I found nothing
might be why the gun was for sale
good luck and post what you find, also email Brobock maybe they have an answer, they should
Thanks for the help. Contacted Brocock and was told to call AOA. Talked to them today and they said I could send it in and they'd look it over, but that there were no parts available for it. Not even a mag. This really sucks as this has been out of production less than 2 years. This does not say anything good about Brocock.
still reading, take a look at this, they mention 2 things a loose allen screw and lubing the mag
http://www.airgunbbs.com/showthread.php?671549-Brocock-Concept-s6-probe-won-t-go-forward
will add as I read more old posts, the point is they should work just fine and many I assume do but just a little thing can cause a whole bunch of grief, I have not found a part diagram and that would help me as an outsider understand the position of the parts so if anyone can post a source do so, I'm just try to help if a can
could it be a breech seal