2-Piper, I have no information beyond what McIntosh said, and I can't seem to find my copy of "Best Guns" right now (1,000 years from now an archaeologist will excavate my filing system and mistake it for a rubbish heap). I seem to recall from discussions on this forum several years ago that Winchester probably got the idea from BSA, who probably got it from Pieper, but all claimed credit for it!