I have a new pair of blue ROAs and the nipples are stainless. They also do not hit the hammer. The hammer lands on the frame if dry fired. I have shot them twice so far and used #10 Remington caps. I had no caps fall off, but twice I had to hit a cap twice to fire it in a 5 stage match. I blame the new rules for that. I don't think I had the caps on staight and on the nipples far enough. I loved the new ones. Shot the match with no pistol misses and only one rifle miss. Durn, almost a clean one. :-)
BTW, I also have stainless ROAs and one thing that is different is the hammer spring. The staineless ROAs have a stainless spring, but the rate feels the same. I don't know why they would't use the same spring in all ROAs. Also, there is a rumor that they are not making the 7 1/2" blue ones with fixed sights any more. I know Davidsons was closing out of them and I got them for a great price.