The safetry on my new M14 from Norinco is so hard to engage that I have to use a nail to pull it back to safe mode. Pushing it out to fire is not an issue, just slight finger pressure required. I lubed the whole trigger assembly hoping this would help but just a bit better. I think there is an issue with the spring or parts that need to be filed down. Anyone else had this issue, and what is the best fix?