Hi all. My mini 14 was made in july 1976. The left side of the receiver has more functions than the newer ones. What is the difference in this receiver and a new one? And, why did they change them? I think it has a rolling block instead of standered.Ruger sent me the wrong manual for it and now have to wait another week to get the right one. All help and info is much appreciated. thanks **** Dawg :rapid: :samurai: :beer: 