Red Kettle Quick Release Rifle Sling. The Quick Release Rifle Sling M19 is a sling that extends by the pull of a secure buckle. You can carry your rifle securely on your back. And get it into action in a matter of seconds. Sometimes you need both hands free when hunting from a bike. Or if you negotiate tough terrain. But carrying your rifle across you back slows you down. This sling provides secure carry and lets you stay fast.