The upper had a ton of sand in it. It was everywhere. This is very fine sugar sand and it just got in every nook and cranny, but the upper had more caked sand simply because there was more lube in the upper. Of course starting the day out with more lube played a vital role in keeping the gun up.That was part of the reason I even beat the gun up that way. People need to go shoot in those conditions with their lube-not-needed fancy boutique AR assemblies and get back to us.
I did take a pic of the BCG, but I cannot find it on my phone. Because the ejection port was open the place sand ended up inside the bolt. I surmise it went through the vent holes in the carrier. Unlocking was really difficult and required mortaring the gun almost every time I needed to make the gun empty. However, shooting it had enough force to cycle the action so it still "worked".
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That was part of the reason I even beat the gun up that way. People need to go shoot in those conditions with their lube-not-needed fancy boutique AR assemblies and get back to us. 

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