The invention relates to a biopsy needle wherein the cannula and stylet may be arranged in a locked position, preventing longitudinal movement relative to each other, and a reusable biopsy gun comprising means for moving the biopsy needle from its locked position to an unlocked position where the cannula and stylet may be moved in the longitudinal direction relative to each other. The invention furthermore relates to a kit comprising at least one biopsy needle and a biopsy gun as described.