Originally, the Remington/Walker trigger incorporated a bolt lock when the safety was "ON". But, it wasn't a 3 position, the safety was either "ON" or "OFF". This ment that if the rifle was to be unloaded by manipulating the bolt, the safety had to be in the "OFF" position (think about it, the ADL model has no floorplate). This condition publicized many unintentional discharges where several were killed. BIG law suit! The 'locked on safety' was eliminated, and eventually, the Walker trigger was 're-engineered' into what comes now on the rifle, which many shooters replace because of it poor pull qualities. I've built many 'classic' rifles using Mauser '98 actions (which I have re-carburized). The overwhelming choice of my clients is the 3 position safety, like is shown in the video the Butterbean provided. Personally, I've never had a problem keeping the bolt on a Rem 700 closed in the brush or anywhere else, for that matter.