The MadbullSteelThread Adapter fits all WE 1911s, as well as any WE or SOCOM Gear M9s with an internal threaded barrel. Steel construction is durable and won't strip. 14mm counterclockwise threads will fit most airsoft silencers. This adapter will fit the WE 1911, as well as any WE Hicap model. It will also fit the WE M9 or M9A1, as well as the SOCOM Gear MEU, M9, or other models.