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Hi Marty and welcome. The Brigade BM9 9mm has a barrel thread pitch of 1/2x36 tpi. Cheers, stay safe and enjoy!

Good evening to you!! The thread pitch on the BRIGADE BM9 9MM 5.5" Pistol is 1/2x36. This means the barrel is threaded with a 1/2-inch diameter and 36 threads per inch. It is compatible with 9mm approved muzzle devices and suppressors with the same 1/2x36 thread pitch. Hope this was helpful. Have a good rest of your day.