American Tactical Imports GSG 1911 Silencer Adaptor 1/2x28 Black. One end screws onto the metric M9 x .75 threaded barrel of the firearm. The other accepts standard 1/2x28 threaded silencers. Compatible With GSG922/GSG-522PK May Not Fit All Suppressors Does Not Come With a Thread Protector Specifications for American Tactical Imports GSG 1911 Silencer Adaptor 1/2x28: Manufacturer: American Tactical Imports Color: Black Fabric/Material: Steel Gun Make: German Sport Guns Gun Model: 1911 Condition: New Package Contents: American Tactical Imports GSG 1911 Silencer Adaptor 1/2x28 What firearm models does the manufacturer say American Tactical Imports GSG 1911 Silencer Adaptor 1/2x28 is compatible with? The manufacturer suggests that American Tactical Imports GSG 1911 Silencer Adaptor 1/2x28 is compatible with 1911American Tactical Imports 813393016325: GSG 1911 Silencer Adaptor 1/2x28 Black