This MPX 9mm "New Style" Gun is notorious for breaking the original firing pin. Made from Grade 6 Titanium which has an Ultimate Tensile Strength of 130 to 150 KSI. These are brand new and designed to fit the 1911 45 ACP. Titanium is 40% lighter than your standard grade of steels thus giving you a faster lock time. Titanium is also Corrosion- and high-temperature resistant to help eliminate galling, fretting, and seizing. All Pins are shipped with material certification sheet.Our Pins Don't Break. Made in the USA!