SIG does sell gen 1 modules but they don't list different parts numbers and there is no way to tell whether you'll get shipped a gen 1 or gen 2. You might have better luck calling other vendors directly to specify a gen 1.
However, if you dont mind the new gen 2 slide release, then just order from SIG. I believe they are still sending out the gen 2 slide release (free of charge) along the gen 2 modules. But check with them to confirm that. Its a really easy two minute install. Highly recommended. The gen 2 modules seem to have a better, smoother finish.
Also congrats on the new piece! - from up the road in STL
However, if you dont mind the new gen 2 slide release, then just order from SIG. I believe they are still sending out the gen 2 slide release (free of charge) along the gen 2 modules. But check with them to confirm that. Its a really easy two minute install. Highly recommended. The gen 2 modules seem to have a better, smoother finish.
Also congrats on the new piece! - from up the road in STL