Well, it's difficult to determine. You'd have to look into the background and the creator's statements to know for sure if Muzzle has any roots in real events.
The device on the Barrett's muzzle was a muzzle brake. The muzzle brake was a device installed on the muzzle of a rifle. It was used to divert part of the exhaust gas to the back, providing thrust to the front of the muzzle to offset part of the recoil. It could reduce the muzzle flare, reduce the exposure of the muzzle flame, increase the energy of the bullet, stabilize the trajectory, and reduce the recoil.
Muzzle fire is significant as it can convey the immediacy of a shooting event. It gives a visual cue that a weapon has been discharged, which is crucial in action - packed scenes in graphic novels.
The depiction of muzzle fire also has an aesthetic aspect. Artists may use different styles to draw it, like bold lines or bright colors to make it stand out. In some science - fiction graphic novels, muzzle fire might be depicted in a more futuristic way, perhaps with a different color or shape to match the advanced weaponry.
I don't know. It depends on the quality and reliability of the sources cited on the Wikipedia page about Muzzle. You could look for additional reliable references to confirm if it's a true story.