Help diagnosing multiple issues today

[vicious_cb]

This is hard to actually diagnose, since you cleared some issues and moved on and then swapped stuff around. You need to go back to ground zero and start over. I will tell you that I have had issues with PPU 75gr. ammo in the past. It was blowing primers quite frequently. I think it was due to the primers not being staked right, and not due to pressure.

I would put everything back to zero, and then start with quality known ammo that you know 100% works without issue.

Very odd. How recent were the lots? Ive fired maybe 7-8k rounds the stuff both green and blue box and only had 2 failures, one popped primer and one bullet setback.

[Iraqgunz]

A few years for sure. I dumped it after I saw issues as I wasn't in need of another kaboom.

Very odd. How recent were the lots? Ive fired maybe 7-8k rounds the stuff both green and blue box and only had 2 failures, one popped primer and one bullet setback.

[Sry0fcr]

Is it worth repeating a third time that the upper is brand new? Or do you believe that it really does need to be cleaned that thoroughly after receiving from the factory?

I agree on the springs though, I actually just pulled my buffer spring and compared it against a new one. It’s about half an inch short. My assumption is the same as above though - if it was a buffer/spring issue, then wouldn’t I be likely to have failures to lock back on an empty mag? And it doesn’t explain the round stuck in the chamber?

Slow down cupcake, my post was general advice and not a diagnosis. But yeah, pulling the BCG apart and giving it a quick wipe down, visual inspection and lube isn't the worst thing you could do for a "new" upper before putting it into service. At the very least it's another variable eliminated.

[Wake27]

Slow down cupcake, my post was general advice and not a diagnosis. But yeah, pulling the BCG apart and giving it a quick wipe down, visual inspection and lube isn't the worst thing you could do for a "new" upper before putting it into service. At the very least it's another variable eliminated.

I did that. I don’t know if it’s showed up in any of my posts because Tapatalk kept crashing and making me re-write them, but it was done.


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[Alpine2k3]

So your problems went away when you switched lowers? Or are you still getting the same problems with the lower you switched to?


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[Wake27]

So your problems went away when you switched lowers? Or are you still getting the same problems with the lower you switched to?


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The locked trigger went away but that was it. It’s going in for warranty work today. I reached out to the manufacturer to get their thoughts and they didn’t hesitate to say they wanted to take a look.


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[Wake27]

Got the upper back from KAC today. They shipped it back to me on the 11th business day which is pretty damn good considering that I assume they’re working on contracts right now since uppers are OOS everywhere. Similar to my BCM last week, there was no indication of what was done to it. I know it’s the same rail because I can see where my grip and light were mounted, but that and the barrel at least got a healthy amount of oil. I didn’t look at the receiver much though, I was far too distracted by the shiny new sandcutter carrier that was inside... I was pretty surprised to have an issue from the factory, but it’s a good reminder that it’s always possible. Seeing as how I’ve had to send a few expensive things back in the last year or two, I’m very happy with how they handled it.

Ultimately I think I’m going to replace it with a 14.5, just because this is my only 16” gun and while I had reasons for trying it, that extra inch doesn’t feel worth it when paired with the Razor and M600DF.


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