Snap into position

I’m try to get an old time feel, for example when a character is standing idle hands by his side and you press the shoot key he instantly snaps to his aiming position without the animation transition from standing to aiming pose.

Anyone know of how to accomplish this instant pose change? I currently have and example that changes to an animation on a bool that the button is pressed but as you can see he raises his arm it doesn’t just change to that single frame.