The blaster (which you can see in the image above) has a fairly large front end. When it came to introducing the weapon to the live-action world, Doust and his team wanted to find a reason for it to look like this. They actually managed to come up with a pretty creative solution. As Doust explained:
“I had this idea that maybe it’s the fact that when you use a blaster in a gunfight, you pull the trigger, the blaster gets hotter and hotter and hotter, eventually it doesn’t And with a flick of the wrist, that whole middle section flips over and installs a cool, cold new barrel on the front of the blaster… That would work just fine.
So not only did they bring an expanded universe weapon into live-action, but they managed to improve its functionality. It’s something Diego Luna adopted and used while filming the “Rogue One” prequel. Doust revealed that the actor was actually pretty good at using this barrel-changing mechanism.
“Diego [Luna] got really good at flicking the wrist, very subtly pressing the button that controlled the mechanism that rotated the barrel. You see him do it multiple times in certain scenes, and it’s just that nice little detail.”
And so, between a video game and real-world ingenuity, we got Cassian Andor’s blaster.