Ed Brown Products Magazine Release 1911 Drop-In Oversize Button Stainless Steel. 375 diameter oversize button. The oversize button allows faster and easier magazine changes without shifting your grip great for competition or speed shooting. Drop-in fit machined from solid bar stock and heat treated for durability. Button has beautiful machine cut checkering at 40 lines per inch. Includes oversize button & screw. Fits all single stack 1911 frames. Uses existing magazine catch spring and magazine catch lock or purchase Ed Brown rebuild kit #814 or #814-S. Specifications for Ed Brown Products 1911 Magazine Release & Button: Manufacturer: Ed Brown Products Gun Model: 1911 Fabric/Material: Bar Stock Steel Package Contents: Ed Brown Products 1911 Magazine Release & Button What firearm models does the manufacturer say Ed Brown Products 1911 Magazine Release & Button is compatible with? The manufacturer says that Ed Brown Products 1911 Magazine Release & Button is compatible with 1911Ed Brown Products 844: Magazine Release 1911 Drop-In Oversize Button Stainless Steel