Evolution Gun Works Oversized Firing Pin 1911 .075 Springfield. 001 to eliminate primer flow and primer shear. Match guns using hot loads can produce primer flow around the firing pin. When the barrel unlocks it can shear the primer and block the firing pin which can cause miss-fires due to light hits. Offered in .066 .068 (Colt / Caspian) .073 .075 (most Springfields) .093 (GI 45). Many manufacturers have moved to the small firing pins for their 45 caliber guns which is a good idea and adds to reliability. Not available in titanium as this contributes to light hits and has issues with chipping. Specifications for Evolution Gun Works Oversized Firing Pin 1911: Manufacturer: Evolution Gun Works Color: Silver Package Contents: Evolution Gun Works Oversized Firing Pin 1911 What firearm models does the manufacturer say Evolution Gun Works Oversized Firing Pin 1911 is compatible with? The manufacturer suggests that Evolution Gun Works Oversized Firing Pin 1911 is compatible with Springfield Armory 1911 Colt 1911 Glock 45Evolution Gun Works 10071: Oversized Firing Pin 1911 .075 Springfield