AR-556 suddenly wont eject casings today

[The Norseman]

Did we ever come to an conclusion why
the AR is not firing correctly?

 

[Jeepnik]

It's an AR. I expect them to fail even when clean and lubed. Sure as heck aren't going to count on one that's sat around for a year with the lube draining off.

 

[bear007]

Did we ever come to an conclusion why
the AR is not firing correctly?

I don't think @llymphs17 has been back to the range yet to give it another try. Sounds like he has a lot going on right now.

My 2 cents, run an AR bolt a little wet. If it ran fine a year ago it should be a fine again after a little TLC.

 

[Mobuck]

I carry AR's full time in vehicles and/or farm tractors. They don't get cleaned often while being subjected to far more dirt, dust, trash, and debris than would expected anywhere other than full on combat. Typically, I confirm zero with a couple shots every 2-3 months and refill the mag. I can't remember the last time one of these rifles failed to operate as expected. For a couple of them, the only cleaning for months on end is a bore snake if they get rained on.
It's a personal choice whether one cleans after every firing session BUT don't believe those claims that's it's a necessity.