I think Jones is correct. I knew two guys that worked Animal Damage Control for USDA and hazed blackbirds out of sunflower fields day after day from aircraft. They shot cases of shells weekly. They took their Benelli's apart, dumped them in barrels of gasoline, and reassembled them the next day. Never a problem with either gun. But personally I wouldn't be caught dead using one of those machine guns on game. Going to buy some Tri Flow and give it a try....will it hurt wood?