Weapon

def __init__(self,
             sight_height: Optional[Union[float, Distance]] = None,
             twist: Optional[Union[float, Distance]] = None,
             zero_elevation: Optional[Union[float, Angular]] = None,
             sight: Optional[Sight] = None):
    """Initialize a Weapon instance with given parameters.

    Args:
        sight_height: Vertical distance from line of sight to center of bore,
                     measured at the muzzle. Defaults to 0 if not specified.
        twist: Distance for barrel rifling to complete one complete turn.
              Positive value for right-hand twist, negative for left-hand.
              Defaults to 0 if not specified.
        zero_elevation: Angle of barrel relative to sight line when sight
                       is set to "zero." Typically computed by Calculator.set_weapon_zero().
                       Defaults to 0 if not specified.
        sight: Optional Sight properties for advanced sight calculations.

    Example:
        ```python
        from py_ballisticcalc import Weapon, Unit, Sight

        # Basic weapon configuration
        weapon = Weapon(
            sight_height=Unit.Inch(2.5),
            twist=Unit.Inch(10)
        )

        # Advanced weapon with sight system
        weapon = Weapon(
            sight_height=Unit.Inch(2.5),
            twist=Unit.Inch(10),
            zero_elevation=Unit.Mil(0),
            sight=Sight(
                'FFP', 
                scale_factor=Unit.Meter(100),
                h_click_size=Unit.Mil(0.2),
                v_click_size=Unit.Mil(0.2)
            )
        )
        ```
    """
    self.sight_height = PreferredUnits.sight_height(sight_height or 0)
    self.twist = PreferredUnits.twist(twist or 0)
    self.zero_elevation = PreferredUnits.angular(zero_elevation or 0)
    self.sight = sight