this is a glue in 1/4-20 adapter for an airsoft WinGun 1911 (non-blowback) CO2 pistol. these things shoot super hard but are pretty loud. now you can fix that with the muzzle device of your choice. i permanently attached mine to the outer barrel with superglue and printed a thread protector cap.
WG1911_.5x20_adapter.stl | 261.3KB |