Liberty Precision Machine Eclipse Flash Hider 30 Caliber 1/2x28 3.05in Long for a 13.7in Pin and Weld Nitride Black. Important Disclaimer: Use of This Muzzle Device May Void the Warranty Policy of Some Silencer Manufacturers. Liberty Precision Machine LLC Will Not Be Held Liable for Damage to These Products. Always Confirm Alignment Before Use. Specifications for Liberty Precision Machine Eclipse Flash Hider: Manufacturer: Liberty Precision Machine Color: Black Finish: Nitride Fabric/Material: 17-4 PH Stainless Steel Threads per Inch: 1/2x28 Projectile Caliber: .30 Caliber Features of Liberty Precision Machine Eclipse Flash Hider All critical alignment features machined in one set up Package Contents: Liberty Precision Machine Eclipse Flash Hider Liberty Precision Machine LPM-2007: Eclipse Flash Hider 30 Caliber 1/2X28 3.05in Long for a 13.7in Pin and Weld Nitride Black