Originally Posted by wake911
My Production D1 is 400S plastic. My M4's, D3's, M1's do not specify plastic, as they are proto's. (i think proto, maybe first run)
I checked the M4, and there are no markings on the bottom that state G or anything.
The only production run available to the masses for 400-G is the M4. But not all M4s are 400-G. The first protos off the line were 400-S. I have also been told all stock stamps will have the 400-G on the stamp. Right now if you have an M4 you can look on the rim where the weight is and look for a "G" next to it. If you don't see it, you don't have a 400-G disc