Abstract: A modular crossbow for shooting a bolt and a method of customizing thereof. One modular crossbow comprises a tiller; a prod comprising a bow and a bow string, the bow attached to the tiller by a prod fastener at a predefined prod location; and a trigger mechanism attached to the tiller by a trigger mechanism fastener at a predefined trigger mechanism location, the trigger mechanism arranged to hold the bow string in a cocked position and allow shooting the bolt by releasing the bow string. The prod fastener is configured to allow changing the predefined prod location along the tiller, and the trigger mechanism fastener is configured to allow changing the predefined trigger mechanism location along the tiller.