I generally carry 9 round extended magazine as a backup for my Springfield Armory XDs 9mm. When I carried a S&W Shield, I carried the 8 round magazine as a backup, and when I carried a Glock 19, I kept a 17 round Glock 17 magazine as a backup. The obvious thing here is that the extended magazines stick out of the grip of the pistol a bit more than the standard magazines, and in …
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