Its lugged with a threadless fork so maybe '94-ish or so. Grizzlies were very nice bikes but keep in mind that anyone who bought a Grizzly did so with the intention of beating it to death. The crank and FD do NOT look XT or XTR.

$300 seems steep in its current spec. Can the shiop verify its hubs and crankset? Hubs will be coded FH7XX for XT or FH9XX for XTR (FH = freehub), the brakes calipers would be BR7XX and 9XX respectively.