I bought the book 13 cent killers, about the USMC snipers in Vietnam. Before buying it I was thumbing through and it talked about a guy using an M1D in 66 or 67. He was doing counter sniper duty. I didn't realize they were using them this late in the war, but then again the USMC is usually the last to get new gear. Also mentioned using 03A3 and the sniper mentioned there was noting wrong with it and preferred it over the newer rifles because it worked better in the real world, not just the world of shooting ranges. Hevent got far in the book but looks good.