Have you been searching for a way to convert your GSG M1911 or GSG 522PK threaded barrels from their metric thread pitch to a standard 1/2 x 28 then look no further. This adapter is exactly that part you need to allow you to connect your standard threaded 1/2 x 28 suppressor. The adapter is made from steel and features a matte black finish. - Specifications and Features: - American Tactical Imports GER4110112 - Metric to Standard Thread Converter - To adapt 1/2 x 28 Threaded Suppressors - Steel - Matte Black - Fits: GSG M1911 or GSG 522PK