grip size

It does not have to be mentioned specially that a suitable pistol grip is important for the shooting precision.
The matching end of the grip at the bottom is already contained in the price of the standard mode.
Grips are available in all sizes, from large to very small for women or for young people, for example in the case of the following grip:

This grip is much too small for this hand, of course:

Not everyone has the same length of fingers. For a small charge, the trigger distance and/or the grip dimensions (grip thickness) can also be made to suit the user.