Seems like a lot of owners are removing the barrel just to clean or play around with the gun. Most reports say these screws are very very tight from the factory. And are becoming loose after owner R&R. Typical shooter not even using a torque wrench. On a new gun, understandable, but; now the word is out. This is a potential problem spot.

If i ever buy one, I would not be messing with that screw unless that was the only way to remove the bolt for a once per 1000 round cleaning. Am, I wrong or is it necessary to remove the barrel for a basic cleaning?

A new gun can be like a first year new model auto. There maybe some little improvements over time.

I dont like the lock washer idea. I dont know what is going on here but it might turn out that due to a design error a new screw is required for each time the barrel is removed. That would be like head bolts on an engine. They can only be loaded to full torque on time.