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Which Servo Should I Choose For My Nerf Gun? Answered

I wanted to build a servo automated nerf gun ,however i am not sure what type of servo i should choose and how much torque i will require.The gun i want to trigger is a semi automatic nerf barricade rv-10 .Should i buy the small 9g hobby servos' or will my need be satisfied y the larger ones which provide torque.I am not using anything to amplify the pull of the trigger by the servo and i am connecting the servo horn directly to the trigger using a small metallic wire like piece .Please help me chose a servo. 

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Torque requirements are dictated by the desired speed of response, and the moment of inertia of your load. Until you have a handle on that, you can't specify the servo properly. You're left with "try it and see"

Same answer as last time - Asking twice doesn't increase you chance of getting an answer you like.