+**9a1** often refers to a particular specification within [9mm Luger](/wiki/9mm_Luger) ammunition, designed for consistent function. This [Cartridge](/wiki/Cartridge) variant is commonly employed in a wide array of pistols and submachine guns.
+## See also
+- [Firearm](/wiki/Firearm)
+- [Ammunition](/wiki/Ammunition)
+- [Caliber](/wiki/Caliber)
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