Check them out on the webstore, they’re back and shipping now! If you’ve got a GSG / ATI 1911 pistol, you need one of these to fit American-standard .22lr silencers and other muzzle accessories to the barrel. The GEMTECH adapters are threaded 1/2-28, includes a knurled thread protector, and gauged for perfect concentricity and straightness to avoid baffle strikes.
http://www.gem-tech.com/store/pc/GSG-1911-1-2-28-Adapter-25p146.htm