How do I get the front nut off to put my suppressor on?
Turn it… 
Mine unscrews easily…
Mine unscrews easily…
If you bought it used the previous owner may have rockset it and the muzzle nut will have to be set in boiling water to loosen it. Then give a liberal coating of oil to prevent rust.
Boiling water and a wrench, standard lefty loosey, may need to put it in a aluminum jaw vice to get it to come loose. AND MAKE SURE YOU RUN AN ALIGNMENT TOOL THROUGH IT AFTER YOU PUT THE CAN ON SO YOU DON'T GET A BAFFLE STRIKE. The front sight block is held on with that jam nut, there is no shoulder aligned with the bore so crooked suppressors are common on that kind of muzzle. Good luck 
It's also common for folks to leave the crush washer on AR barrels to get a suppressor strike. The alignment tool is a great suggestion.
