Good to hear that my little brothers build party has earned a good reputation! Would like to say I'm proud of you bro.
As soon as AR10 lowers become available again he will be providing the ability to machine those as well. They have just been out of stock now for the past almost 3 months and everyone is waiting on them.
As soon as our Rudius 80% 1911 begins shipping in just under two weeks (Nov 15th) we will be working with him and the machinist to get them going on machining them as well.