im with you on using heat guns, they apply even heat and they are portable lol. I will say though that i plan on making an ALL primitive bow someday, one where i use only stones and stuff like that to create the bow, and sinew for the string, and all primitive arrows. If i do heat treat it or do heat bending i will have to use a fire because thats how it would have been done. so basically i will be put to the test in doing that.i might do it next year or the year after.