Still lookin at lowers. im torn between these two, also open to others similar.
https://www.rainierarms.com/noveske-gen-3-lower-reciever-chainsaw-5-56mm
https://www.rainierarms.com/rainier-arms-ultramatch-billet-ambi-lower-receiver-mod-3
https://www.rainierarms.com/noveske-gen-3-lower-reciever-chainsaw-5-56mm
https://www.rainierarms.com/rainier-arms-ultramatch-billet-ambi-lower-receiver-mod-3