Hi Mikey, I've just joined the mpr club too! Take the o ring out & put the band back on mate! You could put a thinner o ring in as I think that's what Rowan do with their after market barrel bands.
Rick Ardern. RIP mate, never ever forgotten!
Currently in stock........
Steyr LG100 x2, Ripley AR5S x3, hw77 x2, hw80 x2, hw100, hw97, hw98, Walther Dommie, Walther LGV, Stoeger x20s .22, Daystate mk4 in a custom laminate stock, Diana mod 50 + Gamo compact & Röhm twinmaster pistols