I've been trying to get a hold of an M-950 replica for a different project and they're notoriously hard to get. Toytec made an airsoft one a long time ago, which are also annoying to find, but worth a shot. I had one attempt on a cast going from the WTB board but that fell through, unfortunately. Calico still makes the M-100 and a version of the M-950 called the Liberty III, but they're very complicated (and notoriously unreliable) and not the easiest things to try recasting. Maybe one of these days I'll break down and get one... Well, give those models a shot, though the 3d models tend to have texture maps more than modeled details, so you'll lose some detail.