Not really an expert with this, although I have an M&P-15-22 and have had no malfunctions in the couple hundred rounds I've put through it. In looking at the ammo it appears to my untrained eye have a bit longer overall length than it should. Compare them to some other brands and see if that's the case. If so, I'll bet that's your problem.
Jim
Oh, almost forgot, Welcome to the Forum.
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