Wilson Combat Magazine Release Oversize Blue. Perfectly checkered at 40 LPI for non-slip activation and engineered to maximum drop-in tolerances this easy upgrade will improve the feel and performance of any 1911 pattern pistol. Minor fitting may be required. Available in chromoly (blued) or stainless steel. Magazine catch lock and spring not included; CNC Machined from Hardened Billet Stainless Steel; Slightly Extended 1/16" for smooth operation with a radiused button for a unique look; Equally Suited for Competition or Carry; Perfectly Checkered at 40 LPI for Non-Slip Activation; Engineered to Maximum Drop-In Tolerances; Magazine Catch Lock and Spring; Specifications for Wilson Combat Magazine Release: Manufacturer: Wilson Combat Gun Make: 1911 Platform Gun Model: 1911 Package Contents: Wilson Combat Magazine Release What firearm models does the manufacturer say Wilson Combat Magazine Release is compatible with? The manufacturer suggests that Wilson Combat Magazine Release is compatible with 1911Wilson Combat 405B: Magazine Release Oversize Blue