so here we go have a ripley AR4 out with it on sunday an developed a fault. there is a blast of air comming from the loading probe.and way down on power. now im probably going to answer my own question. i had a similar thing happen on my S400 and it was the breech seal that had gone, but i cant remember seeing one on the ripley when it was serviced a year ago by Steve
spelling mightbe hitt n missz but i dont mizz with the Ripley or the S400
Could try tightening the barrel up to compress the O ring, should feel a slight nudge when closing bolt.