Quote Originally Posted by RiceisNice View Post
Best way to use it is to overheat through spread shot (have fun with that) and continue doing so and flamethrower when you have a second remaining on overheat. The damage is apparently snap shotted but I haven't tested it out for myself.
Yup, it can be easily seen on a dummy. Basically overheat, rapid fire + reload and spread shot spam, then flamethrower right before the end of oh.