This is an M9x.75 to 1/2-28 adapter for the GSG Firefly and Mosquito (as well as some others that have M9x0.75 threads). This adapter allows these models to utilize the many readily available accessories on the market for the popular 1/2"x28 thread. Adapter features two flat ridges for installation/removal with a wrench and includes a 1/2"x28 thread protector (to protect the 1/2x28 threads for use without an accessory or for storage)
Adapter and protector are made of high carbon steel and are finished in black oxide.
Dimensions and Specifications: Pistol End Thread: M9 (9mm) x 0.75 Adapter OD Thread: 1/2"x28 Overall Length: ~.7" Largest Diameter (with protector cap installed): 5/8".
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