I was told they had a decent number of them, had uppers too but they are gone.
http://www.brownells.com/rifle-parts/receiver-amp-action-parts/receivers/lower-receivers/ar-15-stripped-lower-receiver-prod54336.aspx
http://www.brownells.com/rifle-parts/receiver-amp-action-parts/receivers/lower-receivers/ar-15-stripped-lower-receiver-prod54336.aspx
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