This product seals the chamber and retains solvents and oils when the gun is left in a vertical position. To clean very dirty barrels, these caps are used to fill the chamber with solvents and let them act. Be sure to fill the entire barrel with solvent. Oil and debris will not enter your action and shot with the sinclair chamber plug.
 Compatible for calibers 308 W - 260 Rem - 243 Win -7-08 Rem