This Colt Mfg optic plate is precision-engineered specifically for 1911 pistol platforms. Constructed from high-strength stainless steel with a sleek black finish, it delivers exceptional strength and durability. Designed for a Shield RMSc and Holosun 507k footprint mount type, this base style adapter plate provides a rock-solid rail interface mounting method for clean red dot optic integration onto your firearm. Safety Note Always ensure the firearm is unloaded before installing or adjusting optics or bases. Verify proper torque specifications during mounting to ensure safe and reliable operation.