As always, another one of your interesting ideas and observations. Years ago I asked if a 99 barrel could be used on a 1920 frame and was told yes, though I was left wondering about the different extractor cut locations. Best of luck with your hip, it is amazing what they can do with hips and knees these days, and I look forward to reading more on your proposition for a 1920 take down/switch barrel.
PS - could you make a two piece stock with a junction block at the breach and the forearm attached to the barrel. Finn Aagaard ran an article in Rifle magazine years ago with a Mauser 96 takedown built on this configuration .
Last edited by S99VG; 08/16/14.
