The ATI GSG Thread Adapter (ATI part no. GER4110112) converts the metric M9x.75 threaded barrel on a GSG 1911 or GSG FireFly pistol to the standard 1/2-28 thread pattern used by most U.S. muzzle devices. American Tactical machines the adapter from steel and finishes it in black to match a factory blued or black-finished barrel. One end threads directly onto the GSG’s factory barrel, while the other end presents a standard 1/2-28 thread for mounting compensators, thread protectors, or other compatible muzzle hardware. It’s the piece that bridges GSG’s European metric thread to the U.S. standard most aftermarket muzzle devices are cut for.

Key Specifications

• Converts the factory M9x.75 metric thread to a standard 1/2-28 thread pattern.
• Purpose-built for the GSG 1911 and GSG FireFly pistols.
• Machined from steel for durability under repeated mounting and removal.
• Finished in black to match a blued or black barrel.
• Lets a GSG owner mount any standard 1/2-28 threaded muzzle device compatible with their barrel.

Frequently Asked Questions

Does this adapter come with a muzzle device or suppressor? No, it’s a thread adapter only; it converts the barrel’s metric thread so a separately purchased 1/2-28 device can be mounted.

Will this fit any GSG pistol? It’s built specifically for the GSG 1911 and GSG FireFly’s M9x.75 threaded barrel, not other GSG models.

Buy the ATI GSG 1911/FireFly Thread Adapter

Get the correct thread adapter for a GSG 1911 or FireFly from American Tactical / ATI in our 1911 parts selection. Order it from our Lubbock, Texas gun shop, and our team will let you know as soon as it’s ready to ship.