This KX3 flash suppressor features a black phosphate finish, 1.35" diameter, and a 5/8x24 thread pitch. It will work on any barrel length.The Noveske KX3 Flash Suppressor will work on any barrel length. All KX3s are individually serial numbered for quality control and come with a crush washer for timing purposes. Features: Heat treated CM construction The Noveske KX3 flash suppressor will work on any barrel length All KX3s are individually serial numbered for quality control and come with a crush washer for timing purposes The Noveske KX3 is classified as a flash suppressor by the BATF FTB Made in Grants Pass, Oregon USA