there may be a lot more 97s [or are ] than pro sport .alot of people may get a 97 as a first gun ,when they wish to try a new gun its 97 for sale ,also I know this my get a negative response I belive 177 at 12 ftlbs is a better cal than 22 alot of people get rid 22s for 177 when they realize there mistake .The majority of second hand 97s are 22 .I do understand there may be more 22s sold than 177 new ,but the ratio is not as high as 22 sold second hand .If you want to hold out for a 177 97k there are not that many.