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I had bought several of these over the years. Some had an internal rivet block, some had an external rivet through one of the number holes. Many years ago, I bought Wolff replacement springs for the mags. Never had a problem with any of them. I did not replace the mag springs due to any issues, just wanted the best possible product in them.
This was several years ago and I have since sold them all.
I would imagine current quality would be the same though.
1. It makes it easier for the mags to drop freely from the gun because of the added weight and more to grab on to in case you have an issue and need to rip the mag from the mag well. (PCCs especialy) 2. It’s aesthetically pleasing to some people