It's only called a 5 screw if it has 5 screws
The one screw basically.
The Smith and Wesson model 27-2 denotes that there was a second engineering change to the original model 27.The second change indicates that Smith and Wesson changed the cylinder stop,and eliminated the trigger guard screw.
Smith and Wesson Model No. 2
No tirggerguard screw is the main one.
The frame size of a Smith and Wesson model 66 is K.
Probably a Model 66
No such model listed in the Standard Catalog of Smith and Wesson. You will need to call the factory.
Smith&Wesson model 14
The Smith and Wesson model 19-5 was made from 1982-1985.
The smith and wesson model 18-3 was made from 1967-1976.
Via the screw.
No