Check your mag catch. The face of the button should be flush with the threaded part of the mag catch.
To adjust:
With an unloaded rifle, remove the upper from the lower.
Then use a pencil with an eraser on the end and depress the mag release but as far as you can. Then turn the mag catch clockwise, check to see if it's flush, repeat until it's flush.
Then try other known gun mags, run the gun wet and you should be good. Two live round double feeds are a mag problem or mag catch issue. A spent shell casing and a live round stoppage is typically a bad extractor, bad extractor spring etc. Sometimes the ejector can overpower the extractor. Be sure to lube up the ejector by dropping a drop of oil on the face of the bolt and work the ejector up and down a dozen times. On a CAR length gun like the LMT you might try running a Crane O-ring on the extractor spring if there isn't already one on it especially if you're running a CAR weight buffer (3.0oz).
Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
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