USED KAK Extended Flash Can 5in. The Bore Will Allow A 9Mm To Pass Through This Is A Solid 6061 Aluminum Device That Is Designed To Direct Muzzle Gases And The Muzzle Flash Forward. Threaded 1/2-28 For 5.56 Or Similar Weapons. Black Military Type Hard Anodizing. This Device Is Not Designed To Reduce Recoil Muzzle Rise Or Flash Signature. This Device Is Designed To Direct Gasses And Noise Forward Away From The Shooter And Enhance The Weapons Appearance.. 1.360 Dia 5.00 Long 6061 Aluminum Black Hard Anodized Finish 7.75 Oz. 3/4 Wrench Flats Specifications for KAK Extended 1/2-28 Flash Can: Manufacturer: KAK Industry Threads per Inch: 1/2x28 Weight: 7.75 oz Color: Black Fabric/Material: 6061 Aluminum Package Contents: KAK Extended 1/2-28 Flash Can KAK kak-ind-EXTD-1228-flash-can: Extended 1/2-28 Flash Can 5in