 
This is a non-canon weapon that will appear later in the zombies storyline by HellHoundSlayer. It is a extremely powerful flamethrower, and is usually just known as the Phoenix. It emits high powered flames that will rapidly burn enemies. It was created by scientist at the pentagon i nthe early 1960's.
Trivia[]
it is unknown what "R" stands for in it's name, but it is thought to stand for Raptor, as it was theorized to be created by Dr. Raptor.