I bought the gun pretty much brand new (I couldn't tell that it had been fire at all)...and the nut is not scratched up or anything. Leading me to believe that it was done at the factory.
The way I found it, was that the thumbpiece seemed to be looser than it should be. So, I tightened....and I never felt any resistance at all...it just kept spinning. Backed it off, and there it was. Weird.
|