You don't give nearly enough information.
Check out the RED RIFLES posts or better yet, the Equipment Exchange on this site.
Condition is everything, when it comes to milsurps. Especially if all the numbers match.
Check out some of the banner sponsors, a few of them are selling M91-30 rifles in FTR condition. Your M91 should be worth appx 25% more if in similar condition.
You don't mention if it's Russian, Belgian or Finnish marked