Squaregrouper
Kragaphile
PSA AR10 complete lower $149 (Must be ordered by your FFL)
http://palmettostatearmory.com/psa-gen2-pa10-308-complete-classic-lower-receiver-516447192.html
http://palmettostatearmory.com/psa-gen2-pa10-308-complete-classic-lower-receiver-516447192.html