My advice...and trust me I've been there before with the LaRue stuff, is to either send it to LaRue and let them remove it or take it to a qualifie gunsmith. The LaRue uppers are put together like cement and I dung the crap out of a gas block trying to get it off. They use red loctite on the screws and I have also found they use it on the space between the barrel and gas block as well, making it a real pain
Jacob