remington model 742,760,6,4,7400,7600ect.
I have been looking frantically for any information on the fact of remington model 742's,760's ....ect,ect being factory tapped or not. I have ordered schematics of the 7400,7600, and have found the schematics of the 742 and 760 on the internet.The schematics show that they all had (4) screws on the top of the reciever called (dummy screws) And I am having a hard time believing that all model 742's, 760's, 7600's, and 7400's were factory tapped, because I have seen models of these at gun shows that did not have any screws in the top of the reciever.
How do I find out which models originally were tapped and which ones were not?