My 141 was ordered with the factory turn in mounts. I got the Recknagel mounts/rings so most of my shooting was done with a scope mounted. I didn't use factory ammo at all as far as I can recall. I sold the gun, but still have those mounts. They were VERY hard to get in Canada, cost an outrageous amount of money and I'm saving them for a potential future gun to use them on one day.