This mag will give firepower to your Ruger P90 gun. This is a 15Rd 45cal gun magazine made by Promag. Easy to load a feeds smoothly. Guaranteed for life. This is a gerat gun mag at a great price. Gunclip Depot has the largest selection of Ruger magazines and gun clips. If you do not see the gun magazine you are looking for send us an email and we will try to locate it for you.