Buster- IMHO you should keep the 99! This seems like a no-brainer. The 99 is a much better gun, and should shoot circles around the 100. Those guns had heavy triggers in them and were prone to not being consistently accurate. At 350, that was an average price, but at 400, it's seeming a little high. NO WAY would I give him the 99 and $100.00. From a collectors standpoint, the 100's are much more desireable in .284. Don't give up on your 99-it's heavier, and not a semi-automatic, but that doesn't matter if you hit 'em with the first shot, does it?