Lets You Install An AR-15 Muzzle Device On Your GSG-5P Pistol
Steel adapter screws into the front sight tower to enable installation of a wide range of popular muzzle accessories on your GSG-5 .22 LR pistol. Standard ½"-28 tpi male threads accept an AR-15-type flash hider or muzzle brake, while three, integral lugs accept H&K-type, twist-on sound suppressors. Included thread cap protects threads when a hider or brake is not installed.
Big Book Catalog, Issue:67, Page:211
SPECS: Steel, phosphate coated, black. 2" (5.1cm) long, 7⁄8" (2.2cm) diameter. 1.4 oz. (39g) weight. Front Threads: ½"-28 tpi male. Rear Threads: 5⁄8"-24 tpi male.