Performed the lip mod on the rest of the magazines I have - realize that I need more now.
Anyway, some of the mags I bought new were from Midway and they are re-branded as 'Stoner', the follower is stamped ASC. Noticed some differences in the magazines looking at the C-Products. I do not know what differentiates the generation changes made to the C-Products but the ASC 30 rounders have thicker springs than the CP. I bought a coupe of 10 round Stoners (ASC) and the spring in those wire size seems about the same as the CP. The Wolf springs are slightly thicker than the CP and are longer. Some of the CP wall thickness is thinner than the ASC and the other CPs.
The followers on the CP were different in the wall to follower spacing, all the ASC had some play as well. But some of the CP ones might have a been done to try and prevent the hanging it up on the welds or front and rear. This might have also contributed to 'tilting' of the followers we used to have with the USGI 5.56 magazines.
So what does this all mean? I don't know for sure if it matters to change the spring in the new ASC magazines. Not even sure that the wall thickness matters unless the old CP magazines end up over time collapsing/deforming and create issues for the follower in a fully loaded magazine.
Just like everyone else here I really don't care, as long as the magazines function 100% when relatively new. With the 'lip mod' of course.