If your sure it is stuck bad... you might want to send the rifle back to Knight and have then remove it so you do no damage. MAKE SURE THE RIFLE IS NOT LOADED BEFORE TRYING ANY OF THIS.

If you really want to try and remove it, there are a couple ways to try and get them out. One method is to put the breech in a soup can and fill the can with a solvent such as liquid wrench or even hot water with soap in it. What we want to do is try and wet or saturate the fowling in the breech. Also pour some of that solvent down the barrel so it will get on the threads down there as well. After soaking it over night, place the rifle in a vice. I like to cover the locking lug and then put the lug in the vice. Then put the breech removal tool on the breech plug and tap on it lightly with a hammer or mallet to see if you can break free the plug a little. Then start trying to turn the thing out.

another thing I have done if the soaking does not work.

Another way is to put the barrel into the freezer over night and freeze it. Then have some water boiling on the stove. Take the barrel out of the freezer and put that into the boiling water and heat the breech end of the barrel up real fast. Now immediately put the barrel in a vice, put the tool on it, tap it with a hammer and start turning it out. If it will not turn out, then you will have to send the barrel in.