i hav an m733.....im usin bbs from wild sports.they sell .2's
bad, buy better quality bbs, and if that doesnt work, clean your barrel, and look for divets and such. if that does nothing, new hop. from then on, no idea
i noticed that in my m733 .25 bbs shoot alot more accurate than .2s not to try to convert you or anything but a better made bb will shoot more accurate and consitant