Simple, you call them, tell them you need one for your (insert model number here) and your local gun store seems to be having trouble getting them. That's all I did and they sent me 1 out and sent one to my son as well.
We just got a special order direct from S&W to the club for training (The club maintains an FFL for such purposes). Every compact in the shipment came with 2 mags with the extensions. I wonder if they will all ship like that now.
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