This KX5 flash suppressor features a black nitride finish, 1.2" diameter, and a 5/8x24 thread pitch. It will work on any barrel length.The Noveske KX5 Flash Suppressor will work on any barrel length. All KX5s are individually serial numbered for quality control and come with a crush washer for timing purposes. Features: New slim design allows installation under the Noveske handguard Heat treated CM construction The Noveske KX5 flash suppressor will work on any barrel length All KX5s are individually serial numbered for quality control and come with a crush washer for timing purposes The Noveske KX5 is classified as a flash suppressor by the BATF FTB Made in Grants Pass, Oregon USA