This tip was sent in by Mark Cortis. He is an NRA Certified Training Counselor from Michigan.
Reholstering A Semi-Auto:
Since many accidental discharges happen while reholstering a firearm, one tip I have to both maintain a good grip and keep the firearm in the proper position thus eliminating the risk of a slamfire is to always put your thumb on the rear of the slide as you reholster. This prevents it from getting hung up and pushed back when reholstering which could result in a slam fire where the unexpected and undesired rapid forward movement of the slide could through kinetic energy cause the firing pin to strike the chambered round resulting in an undesired discharge.
Mark,
That is a great tip and thanks for sending it in. It is also important to FOCUS on keeping your finger out of the trigger guard during re-holstering. Not doing this is a sure way to shoot yourself in the thigh or foot.