Re: how to properly remove a badger handguard
Its been a while, but you will have to remove the gas tube in order to take off the barrel nut assembly. I'm assuming you are using some kind of low profile or non sight gas block. If you have no muzzle device you can just slide off the gas block once the pins or screws are removed. If you have a muzzle device, you will need to take that off before the gas block can come off of the barrel. Even if you cant get the gas block off, you can drive the pin out that holds the gas tube and bring it rearward into the upper receiver and them move it over to the side or above the gas block and remove it carefully forward.
Once the gas block and gas tube are removed, you can now remove the barrel nut assembly. I believe all you will need to do is use a big wrench to break free the handguard mounting block (triangular piece) as you called it. Once that is loose, you can then remove the lock nut on the front of it. This should all come off then once its loose. Chances are its torqued to at least 35 foot lbs, so you will need to safely secure your upper in something. Good luck and if you feel like you are going to mess up anything, just take it to a smith, they should have the proper tools and know how.
Mark