Originally Posted by
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While the SA (Metalform) mags have fixed floorplates, they are the benchmark in 9mm mags.[/quoted]
You're the first person that's said so to me. They're 9rd, yes? Yes. IIRC.
The Wilson ETM mag has been universally recommended to me by the people I trust with the most experience running/building 9mm 1911s. The only complaint I've heard is that they will not always drop free when there are rounds still in the mag, and that the Tripp mags solve that problem.
The gun is coming with a pair of SA mags, and I've got a dozen Wilson ETM and half a dozen Tripp mags on the way.
I answered the caliber question above. I don't understand the other questions.