Not sure if your issues are similar to mine. My AR-10 would jam constantly even after trying multiple mags. Changed from soft point to polymer tips and problem solved.
He has a gas issue. Too little gas. I.e. the bolt doesn't lock back on the last round
I may have figured it out. I'll know for sure after this weekend. I pulled the gas system apart, again. Checked the alignment of the gas port on the barrel in relation to the port on the gas block, its was correct. While checking out the port on the gas block I noticed an intrusion. The hole in the gas tube, fully inserted, did not line up with the hole in the block. There was an overlap. I ran a drill bit thru it and opened it up so there's no intrusion. Hopefully that's all there was.
Seems to be running just fine now. Shot 10 flawless rounds thru it over the weekend. I'll definitely run it some more before calling it good, just didn't want to raise too much havoc at the ranch.
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