Bore pitch

Imagine you have a toy train track with lots of little holes on it. Now imagine you have toy train wheels that have little spikes that stick out of them. When you put the wheels on the track, you want the spikes to fit perfectly into the little holes so the train can move smoothly along the track.

Bore pitch is kind of like the distance between each hole on the train track. In real life, it's the distance between each hole on a gun's barrel (called a bore).

Guns have to be made very precisely so that when you shoot, the bullet comes out straight and hits your target accurately. If the bore pitch is off, the bullet might not come out straight, and it could miss the target. Think of it like how the train wouldn't move smoothly along the track if the holes were too far apart or too close together.

So when people talk about bore pitch, they're talking about how far apart the holes (called rifling grooves) are inside a gun's barrel. This is important for making sure the gun shoots accurately.