What do 3 star and 4 star markings on the barrel of a Charles daly 20 ga mean?

The 3 star and 4 star markings on the barrel of a Charles Daly 20 gauge shotgun indicate the level of proof testing the firearm has undergone. Generally, a 3-star marking signifies that the gun is suitable for standard ammunition, while a 4-star marking indicates that it has been tested for higher pressures and can handle more powerful loads. These markings help users assess the suitability and safety of the shotgun for specific types of ammunition. Always consult the manufacturer's guidelines or a firearms expert for specific usage recommendations.