Normal.
If the blade play becomes too excessive just send back to the manufacturer and they'll fix er up, at least Buck will. Probably minimal to no charge from them as their customer service is terrific.
Try and stay away from prying and twisting actions, esp with folders as this will hasten the blade play.
My 29 yr old Buck 110 folder is still going strong and I've used the crap outta that puppy!
