Jacob Grey Firearms Cobra Billet Muzzle Brake .30 Cal 5/8x24 Thread Flat Stainless Unfinished CMBFSTN. 30 Carbine Finish: Class III Hard Anodized Fabric/Material: Steel Threads per Inch: 5/8x24 Gun Make: AR Platform Gun Model: AR-9 Inner Diameter: 0.34...