Answer:
The impact of this excerpt shows that the person was very scared, being that they have never held a real gun for that long before, and the situation they are in is very dangerous and terrifying. They bring up the closet thing to it was a toy bamboo gun when they were seven, and this displays how once it was a game, just a toy, and now it is real life. (sorry this probs isn't that helpful but i tried my best :)