This isn't very important but I was working on an idea for another story and I needed to figure out what weapon was about to be used. I'm not a gun guy. SO I can't really tell them apart. But I do know what I think is cool and I knew what "cool" looking weapon I wanted to use in the story by the good guys, but didn't know what they were called.
I found the Internet Movie Firearms Database. It's just like the more famous IMDB but the IMFDB tells you what weapons were used in what movie. Some entries features clips of the movie with said weapon being used.
So just a little helpful tool for us writers with little or no experience in weaponry. I find it is always nice to find another tool to make the stories here in SOL as realistic as possible. I mean besides the end of the world or time travel or alien invasion stuff normally happening.