They're way too busy to hang out here.
I know it sounds like a cop-out, but I've been out to their facility, and there are only about five employees, including the owners. The 45s are all done individually, one at a time to user requirements. The ARs are built as needed. They use great parts and are a supplier to a number of other companies. As to their time, when they are working, they are working, and when they ae not working, they try to have "normal" family lives etc...
They were cool enough to do the LEGP deal, and have kept their pricve the same even though the members haven't come through with the numbers to really get the unit price they gave Anti. They are some of the most innovative guys in the AR market today...expect cool new stuff from them later this year and at the SHOT show next year.
Themao...A4 is the standard flat-top. It is actually the correct designation for that receiver, since A3s in the military are A2s with full auto rather than the A2's burst. A4 is the mil-spec designation for their flattops, and both Armalite and RRA use it correctly.
RRA is great on the phone, and they even call you back if you have a question they can't answer right away (try that with some of the other companies in these forums).