Les,
I have looked very closely at the "MP" stamp on the M70 you posted, enlarging it and playing with the lighting. To my eye, it looks like two strikes, with the "P" clearly displacing the metal where the "M" should be. Some on this forum with more experience with stamps and stamping can say better. Without a doubt, it is different than any MP stamp sample I currently have, or any other MP picture ever posted in this forum.
Thank you for the additional info. Can you elaborate on the "Letter dated 1973 from Savage Arms"?
Again, I'm not going to attack the researcher or organization. I will not accept that we can not question "expert testimony", either. (I'd be driving a hybrid Prius, otherwise.) I'm trying to see all the info, including that which was not available to the expert.
