1/2 x 20 UNF adapter for those rapid firing Bullmaster. New and improve design to allow more air flow.

Please note that when you add a suppressor to this gun, it does not properly index the magazine. It uses blowback air to advance the magazine however with a suppressor on, it over rotates and causes it to not properly index. If you plan to single load it'll work fine. Some customers have been able to get the gun to work properly by swapping out the spring inside the shroud with a different strength one. Will take trial an error.

Similar to the Blitz, this guy may need a lighter spring to work with a suppressor. I got mine from Ace hardware. See picture

Features: 

• Compatible up to .30 caliber
• Made by CNC for accuracy
• Material is 6061 T6 Aluminum
• Black anodize
• Diamond pattern knurling for easy grip