Boudin,
I can;t comment about the CORE, have never owned or even shot one.
I can tell you the M&P 15 techtical is nice. I have put several 100 rounds through one. A buddy at the range has one and he likes it and it has been very consistant. We have had no issues with the M&P 15.
good luck with your choice and want to see the results when you have your new weapon.
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