A sling for a shoulder weapon, such as a military assault rifle or carbine, in which the effective length of the sling can be extended quickly and quietly and then easily and quietly retracted to the original length. A quick release plate and an engagement member cooperate to hold a loop of strap material to provide the shorter configuration of the sling, and the quick release plate can pass over the engagement member to lengthen the sling when the quick release plate is turned to a position perpendicular to the length of the sling. The opposite ends of the sling can be attached to a weapon using secure, quiet fittings.