Any way to pause an animation when it finishes?

I'm making a rifle model that uses two hands, so I use an animation to fix them in the right place. It works, but after the animation is over, it returns to the normal tool hold animation. I can't loop it, because it would just play the entire animation over again. Is there any way to have the animation where you pull it out, then when that animation is over, the hands stay in place?