I have had a couple of these types of axial heat gun. They are often sold for greeting card making where an embossing ink expands when heated. Cheap as chips at around GBP12. They are great for shrinking heat shrink tubing and some people have had success using them on SMT work in combination with a warming plate for the PCB. It's anything but a precision heating device though and the nozzle is around 8mm diameter. No temperature or fan speed control.
My first one died after only an short period of use on heatshrink duties and I am guessing the thermofuse went open for some reason. I was going to repair it but found a very nice (pink
![Huh? ???](https://www.eevblog.com/forum/Smileys/default/huh.gif)
) DoveCraft unit on ebay for GBP 10 delivered, so it wasn't worth the repair time. The DoveCraft has a single heat setting but two fan speeds. That unit is still working well.
I personally would not recommend using one for SMT repair work as the nozzle is too large but I suppose it might work if the user was very careful. Do not be tempted to fit a reducer to the nozzle, it will cook the heater for sure.