A sling that can be attached to any rifle, long gun or case, with a single main section of webbing running the entire length of the sling, routed through a linearly moveable quick release buckle, then looped through an oval ring fixed to one end of the sling, back through another oval ring attached to the quick release buckle and back towards the fixed oval ring to form a compound S-shaped adjustment loop with three layers of webbing, laying one on top of the other, giving the sling additional length when expanded, while also enabling it to be fully retracted. The quick release buckle can linearly move along the full length of the sling with the quick and easy manipulation of the buckle.