I have very little experience with my M14 (Fulton/Polytech build), so I haven't a clue how to address what my bolt it doing. Basically it gets stuck randomly both with and without rounds in the chamber; but not everytime. When it happens its when I pull the charging handle, it moves back about a quarter inch until the roller on the bolt fails to allow the bolt to start rotating. It is just begining to move back and rotate, but locks. The only way to move it is to put it into a padded vise and yank on it like hell. Hope I'm describing this clear enough. Any thoughts?