Hmm, thanks... that fits with some similar experiences I’d read about elsewhere (early failure of this particular rubber). Out of interest, what weight of BB were you using and what type of gas?
Wow, that’s more frequent than I’d expected! When I first ran a GBB (few years ago) I don’t think I ever changed the hop rubber once... which may explain why my aim was so bad 🙂
Definitely need to improve on my maintenance regime, it seems...