This appears to have been a custom build during the 1992 model year.  The stock bikes used a full Deore XT build kit with a rigid fork.  This bike has the Suspenders fork with Pro Stop disc brake, Scott Pedersen U brake, Cook Bros Cranks as some of the nice upgrades.  The frame features both top tube and down tube gussets which appear to have only been used on the XL frames.  The word "BLEM" is stamped on the left drop out.  Possibly some type of blemished frame that was made available as a frame only?  Might explain the build kit.