The KAK Plan B A2 Flash Hider features a precision-engineered taper and thread design for 5/8x24 threading with a .375" bore specifically designed for 762NATO caliber firearms.KAK Plan B A2 Flash Hider5/8x24 thread pitch with .375" bore17-4 stainless steel construction with nitride finishOverall length: 1.850" Weight: 2.5 ozMilled rear flats for easy installationCompatible with Plan B suppressor hubsTaper and thread design ensures repeatable lockupDesigned for reliable suppressor attachment with Plan B systems this flash hider provides proper seal between muzzle device and suppressor adapter. Professional installation with Rocksett and 20-25 ft-lbs torque recommended for optimal performance.