Since it was brought up I will expand a lil more on +P ammo.
Calibers such as .45 and 9mm have been around for more than 100 years. In that time the design and specifically the metallurgy of weapons has improved. They are easily capable of the increased pressures of +P ammunition. But, since guns have long life spans manufacturers cannot take the chance that you are not using a modern weapon. It is a compliance issue with SAAMI and litigation.
Wear is typically on the return springs.
Modern service weapons are capable of +P+
+P is NOT a hand cannon. In fact it is simply a moderate increase in pressures.