Any kind of anti seize grease will work. The main thing is you use something. I personally would not use just any old grease, but the anti seize you can purchase at an Auto Parts store, or Slick 50 1 grease, or any of the breech plug greases will work. Some Teflon tape will also help keep that breech plug from getting stuck.

Something you can do to make sure the breech plug does not seize up on you. At the range after ten shots, take your breech plug wrench and just turn that breech plug back and fourth a little. Not that you have to remove it mind you. All you are doing is breaking it free of anything that is starting to seize. If you do this, at the end of your range session you will find the plug comes out nice and easy. Also if you shoot on a range that is a long distance from your home, it does not hurt to take a zip lock bag, remove the breech plug at the range, and the other parts, and put that in the zip lock. That way it will not have a chance to set up.

I know one fellow that carries a plastic jug with a lid. In there jar is soapy water. He throws that plug in there and he "claims" by the time he gets home, the plug has swished around in there enough, it is almost clean. Whether that's true I can not say. This fellow I am talking about likes to stretch the truth once in a while.