Curved side op rod vs Flat side(pics)

[Prince Humperdink]

This comes up a lot,so I took some comparison Pictures.
Here is a Curved side,these were used until SA-9:



Here is a flat side,these started during the SA-9 revision until the end of production revision numbers :

[Det. Jason 714]

Well done. That should be helpful.

[Nodakdad]

I was never quite sure what the difference was until those pictures. Thank you for posting them.