The Kimber Black Mainspring Housing Pin, model 1000043A, is a factory original replacement part designed for Kimber 1911 pistols. Made to the highest Kimber standards, this pin ensures reliable performance and durability. Crafted from high-quality steel with a black finish, it is suitable for various calibers including .45 ACP, .38 Super, 9mm, 10mm, and .40 S&W. Ideal for replacing worn parts or keeping as a spare, this mainspring housing pin is a must-have for maintaining the functionality of your Kimber firearm.