A projectile (1) for a small arms weapon having a muzzle, the projectile having a casing (2) and fins (3), pivotally mounted upon said casing and urged outwardly of the casing, for automatic deployment after leaving the muzzle; wherein the casing is disposed within a cartridge having a sleeve surrounding the casing and fins; the cartridge also containing a propellant charge intended, when detonated, to propel the projectile out of the muzzle; and wherein shielding means (6) is provided to shield said fins and/or their pivotal mountings, at least in part, from the detonation of said propellant.