The movies do a great job of making it look like the recoil from a firearm will either knock down the shooter or blow the person through a window or wall due to the impact. We all know deep down that ain’t true, but let’s revisit Newton’s Third Law for a minute.

For every action, there is an equal and opposite reaction.

So if a shot was to blow someone through a window it would knock down the shooter as well. In reality there are only a handful of civilian firearms capable of a knock down of both the shooter and what is being shot and you don’t really want to be holding those unless you are prepared for the recoil.