Woofie

I own two Armalite AR-10(A) uppers, a T and a carbine but one lower. Getting fed up switching out so polled Armalite about buying another lower. I was told that due to "panic buying" no lowers would be available until 2017 and even then, date TBD. Since our parts are not universally interchangeable, is anyone aware of a manufaturer who actually has Armalite compatible lowers? Not much luck finding one. Thx Woofie