Hey, Just got a 2008 Henry catalog & they list 4 models in .17 HMR and none in .17 Mach II (I would own one if they did !!) Great little rimfire -- not many rifles chambered for it.A Henry would be super.I'll have to settle for my CZ Varmint and contender carbines for now. Sorry,got a little OT ---A Marlin 39 conversion to 17 Mach II sounds like a winner --hope it is possible and not too expensive.