When you shoot the 686 are you shooting it in double action (DA) or single action (SA)? A 686 and a Shield have rather different style of triggers. Start out doing slow, steady squeezes of the trigger.
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Know the status of your weapon
Keep your muzzle oriented so that no one will be hurt if the firearm discharges
Keep your finger off the trigger until you have an adequate sight picture
Maintain situational awareness
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