An in-bore sighting device (10) includes a laser module (12) and energising means therefor which are co-axially receivable in a hollow cartridge casing (14) and which are retained in position within the cartridge (14) by means of a retaining member (16). The laser module (12) includes a laser diode (13) and focusing lens (15) which are housed co-axially within a generally cylindrical housing (18). The housing (18) is mounted co-axially within a sleeve (19) which further defines a battery receiving portion (20) for receiving the energising means in a form of batteries (21) co-axially therein through an opening (22) at an end remote the laser diode (12).
