That nick shouldn't be causing issues with the mags failing to lock the bolt back.
Have you tried other mags in the rifle to see if they hold the rifle open? Also, what ammo are you running? Lower? Buffer? More information could be helpful.
ON a related note, I have had Tula fail to lock the bolt back on several of my rifles, BCMs and even an over gassed Bushy because it wasn't cycling hard enough. Could be the ammo. Could be that the rifle is over sprung, could be several other things as well.
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