Hello again.
That's correct. To answer your other question, I haven't done anything to the carrier key bolts.So 30% of the time the bolt failed to lock open on a empty magazine?
Unfortunately, I didn't get to try your bolt catch test (too late - see below), but will keep it in mind just in case.
I know- looking at the photo, it does look weird. But no, I swear to you, eyeballing them, they look fine.Might be camera angle but the mag does look just a slight bit "whacky" up at the feed lips. They aren't bent at all?
rero360, I did install the M4 RAS myself, but properly installed, I don't believe the little clamp that engages the barrel nut could really do any damage. I did look at that area of the gas tube, but it's fine.
So BCM agreed to take a look at the upper. They'll get it on the 19th. I am glad of this, because they would be able to determine conclusively anything about the gas system, whereas I would not. And one way or another, what I hear from them will either confirm my suspicions, or simplify any further troubleshooting.
I'll update the thread when I hear something.


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