A strap tensioning apparatus consisting of a strap tensioner attached to a firearm, a spring loaded spool contained within the strap tensioner, the strap having one end releasable attached to the spool, the strap exiting the spool, the other end of the strap attached to the firearm. The spool adapted to be adjustable between three different modes: a lock mode, a release mode, and a free spool mode. The strap tensioner allows a user to easily and safely adjust the tension of the strap to increase comfort, mobility, and safety.