Foam for cleaning smooth and rifled barrels from metal residues of copper and lead and combustion generated by bullets and powder.
With the barrel cold and horizontal, spray the foam inside the barrel and leave it to act for at least 30 minutes (depending on the amount of residue to be removed) after which the barrel is drained and wiped with a cloth with a little KENTRON S-2 oil to protect the metal (this last option is recommended and not compulsory).