Unusual problem working the charging handle
I just got my rifle back from a paintjob today. The rifle was bone dry (expected), so I lubed 'er up and went about doing a function check. Using Magpul dummy rounds, after a round is already chambered there is a very distinct (problematic) resistance when trying to work the charging handle.
- Only occurs when trying to work the charging handle when a round is already chambered.
- Does not occur when charging the handle with no mag in the weapon.
- Does not occur when charging the handle to chamber a round.
- Buffer still compresses easily into receiver extension.
- Once the charging handle gets going it's fine, but it's getting hung up on something that I can't see.
- There is a very distinct wear mark on the middle/top of the charging handle.
- There is a very distinct corresponding wear mark along the roof of the upper receiver.
To be clear, these were not problems noticed before sending my rifle away. The only things that have changed since then was a paintjob for the rifle and a very light coating of fluorescent paint on the Magpul dummy rounds. Only a little bit of flourescent orange flakes off when chambering and ejecting the dummy rounds.
I'm befuddled. Thoughts?
-B