I just got back from a three month trip to New York, Ohio, and Germany (Berlin is still awesome).

I wanted to check two things on my Colt LE6920:

1. I switched from Rem Oil to Slip 2000 EWL. Was the action still gummy after several weeks or more?

2. The original battery on my new Eotech EXPS3-0 died after three days. Did I have a problem?

The action is as slick as when newly lubed (no more Rem Oil), and the Eotech battery is strong (no Eotech problem).

During the check out, I noticed the bolt would not lock back unless I manually set the bolt release.
After 10 minutes of trying the same things and scratching my head, I found the problem -- No magazine was inserted !!!

Boy, is three months a long time. But, at least I don't have to be re-trained when I just go to lunch.