How to open a stuck Maglite flashlight?

WD-40?

You might try squirting a small amount of WD-40 along the seam. We used to do this to get stacked metal garbage cans apart to sell at a hardware store where I worked.

WD40 should loosen it and a pair of channel locks or pliers should do the trick.

Chances are the batteries have leaked and corroded the metals together... try the WD-40... but you may not be able to clean out the battery compartment well enough to save the flash light ( we tried to save one of ours... and we did.... but... the new LED flash lights are a lot brighter.... that we really don't use the Maglite at all.

will try wd40 though it seems unlikely thank you all

Agree with WD 40. It works for stuff like this.

the batteries are probably corroded I'd call the maglite mfg.

I've tried everything WD40 a thicker oil two vice grips 10 people it will not come off there's no corrosion or anything I just can't get the end of it off it's like froze

I've even tried tapping the end of it on concrete it's froze somebody told me gasoline is that true

How do I unscrew the end of my flashlight it's frozen I've tried everything WD40 thicker oil vice grips everything will gasoline help

Wow, sounds like you have tried everything. I Just googled "Changing batteries in a Maglite flashlight". Sounds like you are trying to do it the right way...Some put the flashlight in a vise and turned it. Some gave up and bought a new one. Good luck.

Try warming the case with a hair dryer to see if the metal expansion will loosen it.

wD 40 is useless. You have to use a light penetrating oil such as kroil oil or BP blaster. Then you are going to have to put the heat to it. Use small taps with a brass hammer. If that fails put a large monkey wrench on it in a vice.