A stand-by sling characterized in that it comprises a strap-like element (1) made from a flexible, near inelastic material, one end (2) of which element (1) is attached to the sleeve or adjoining area/back of a loosely fitting outer garment, and the other end of which is formed like a loop and placed in the hand of the resting arm at the natural termination of the sleeve (3) (cuff), so that the stand-by sling (1) remains taut during use without the marksman having to bend his elbow.