Sent wrong upper - FM Products FM-45 AR .45 Upper Receiver w/ Micro Brake

I got this upper in 45cal. I received it 2 days ago opened the box it was a 9mm. I called the customer service guy was really nice about and sent me an email for an RMA to get it swapped out. They paid shipping after 3 days I get an email saying they had received it back and it could take 10 to process. So I guess we will see how it goes. It was a really nice upper well built. I'll get back with revised review once it's done. I thought it got here too quickly it said up to 9 weeks to get and it had only been 2. I guessing it will be a little bit before I get the correct one, I haven't received my lower yet so it's no big deal.