I actually found one last replacement cams and my original cam out of my 1st. gen R3M if you are interested. I had moved my shop from one location to another and they got buried in the process. The cams I had made index the mag a bit further and make cycling easier with a less agressive snap back of the bolt. It is more than just a drop in though. They require polishing with 600 then 1000 paper wet and then fit right in for testing and worked fine as is in most cases.
e/mail sent thank you