An addendum to my above post - Decided to send SBT back to Buck Knives for their evaluation & placed it in the mail this AM.
Was pleasantly surprised to receive email soon after from Josh Rummerfield
Director, Buck Tactical Division, inquiring about my post. I am now confident, that with this kind of customer service and concern, this problem will be resolved quickly.
Although my posts have been negative about the liner lock on the SBT 880, this is a great purpose driven knife, and is impressive in its' features, materials and collaborators; and there does seem to be some out there with good lockups. I believe this is a problem that Buck is working hard to straighten out.
Thanks Josh!