Just wow! As a follow-up to your Mag 21 nightmare, please swap these lowers: the S/N should be in the inside of the right lower, as can be seen e.g. in my Rocky Mountain Cirrus build thread (viewtopic.php?f=6&t=390738#p2889945).
Just wow! As a follow-up to your Mag 21 nightmare, please swap these lowers: the S/N should be in the inside of the right lower, as can be seen e.g. in my Rocky Mountain Cirrus build thread (viewtopic.php?f=6&t=390738#p2889945).