Just completed this process last night. Red loctite was used on my M4 which definitely required a higher heat setting. As soon as I cranked up the heat the loctite gave up and let go. Installation was easy.
What does LOP mean. I am a new Benelli m4 owner and took it out to the range this weekend and I am bruised. So, I am betting I am doing something wrong. I read a comment above about poor LOP and I am not sure what that means.