Ed Brown Products Mag Release 1911 Drop-In Stainless Steel. Drop-in fit machined from solid bar stock and heat treated for durability. Beautiful machine cut checkering on button. 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: Manufacturer: Ed Brown Products Gun Model: 1911 Fabric/Material: Bar Stock Steel Package Contents: Ed Brown Products 1911 Magazine Release What firearm models does the manufacturer say Ed Brown Products 1911 Magazine Release is compatible with? The manufacturer says that Ed Brown Products 1911 Magazine Release is compatible with 1911Ed Brown Products 855: Mag Release 1911 Drop-In Stainless Steel