One of the nicest billet lowers I own has been the UCWRG billet ambi lower receiver. It utilizes the A-DAC ambi bolt catch that is tied into the mag release and is such a beautiful piece of machining. Unfortunately they have almost never been in-stock…until now. Right now UCWRG has 45 billet lowers in-stock. I’ve also heard that those who ordered billet lowers have received shipping notices. If you want a chance to snag one, head on over to www.UCWRG.com and pic one up for yourself today.