the XD and XDM were both manufactured with Nato ammo in mind. many manufactures marks their 9mm Nato as +P because it has higher pressures than standard 9mm para or 9x19mm. even though these calibers are all interchangeable some guns can not handle the extra pressures of Nato Spec ammo over time.
FWIW, the XDM has been proven several times to handle +P+ so I wouldn't worry about 9mm nato ammo.
all guns lost in a tragic smelting accident.
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