another question is when i get this filed off enough to engage the latch will the release lever pop all the way up when closed.if so then i know i need to keep filing.
NO NO
Don't file it until the release lever is all the way up.
Like Pete said, keep checking the latch shelf until you are getting good engagement.
If I fit a barrel I try to get 1/16th inch engagement.
If you file until the release lever is all the way up, as the shelf and latch mate to each other it will probably end up loose on the frame.
The release lever should not be all the way up.
It should have PLAY AT THE TOP WHEN THE BARREL IS LOCKED UP.
Please go slow and be careful, it doesn't take much to go from a good fit to a loose fit.
It's easier than it sounds, just take your time.
Spanky