Hi there ,i have a mk1 22 superstar that i have had 19 years from new ,love it to bits it gets used nearly every weekend and has never let me down in all those years. i feed her rws superdomes at the moment and have just upgraded the scope to a hawke 4-12-50 ao ir , we have taken many a woody and lost count of how many squirels over the years. I hope you enjoy yours mate..is yours the same as this one if yes then its a mk1 if not yours might have the different muzzle break with internal thread for a silencer that would be mk2 hope this helps...