Gauge (bore diameter)

Gauge or bore diameter is the size of the hole inside a gun barrel, which is where the bullets go through. Just like how you use different sized straws for different drinks, guns also have different sized holes based on the type of bullet that will be used. A smaller bore diameter means a smaller hole and a larger bore diameter means a bigger hole. This affects how much gunpowder is needed, how far the bullet will go, and how much recoil or kick the gun will have. So, it's important to choose the right gauge or bore diameter when using a gun.