Anyone know of a source for A2 upper receivers ? I've looked all over, most are either out of stock or ridiculously priced. Delton has an A2 style upper but it is perpetually out of stock and H&R hasn't started producing them yet. Gunbroker doesn't allow me to do business with them so that route is out. New production is fine, not looking to build some period correct clone, just want to build a handy little carbine with an A2 upper.