A cable lock like the one Ruger provides has to loop through the magazine well and ejection port, preventing the handgun from being loaded. A triggerguard-mounted lock still allows the gun to be loaded. No manufacturer of such locks recommends this, as there is the possibility of tripping the trigger while installing or removing it. With the heavy DA trigger pull of this particular gun the probability is low, but still possible, e.g., from fumbling with it under stress.