BudsGunShop.com - P designation

It means it's rated for +p ammunition. +P ammunition is a little bit higher of a velocity and pressure than standard ammo, most modern firearms can handle +p ammo but not all. Usually only defense ammo is +p rated and manufacturers recommend limited use of it cause it can wear out parts of the firearm quicker than standard pressure ammo. Hope this helps.

If you are referring to the P in JHP its for a Polymer IE Polymer frame if you mean the +p its rated for the hotter +p 45acp ammo

Alan, +P is a designation for higher Pressure Ammunition than standard SAAMI Pressure Ammunition. Details here : https://en.wikipedia.org/wiki/Overpressure_ammunition