Geoff.223, Yes. Once I placed the rubber washer where it should be it is cycling every thing I have put through it inc 24g 7.5 65mm 28g 7.5 and 8 67mm and 34g 9ball SG's 70mm. So far I h ave used RC and Gamebore cartridges in it with out problem. I am told it is better to use the 70mm and 76mm cartridges in them but I have had no problem with the others.