Don't buy it - Matador Arms Mat9 9mm Luger 7.825inch Upper Receiver

I was super excited about getting this upper receiver. Unfortunately, it took less than 10 rounds of subsonic 9mm to break the bolt carrier on my first range trip. The carrier looks like it was made from cheap pot metal. I have emailed Matador Arms, but haven't heard back from them yet. I am assuming Brownell's discontinued the BRN9, which was made by Matador Arms, for this reason. I am now the proud owner of an expensive paper weight rather than the home defense gun I was planning on. I would not buy this product.