I'm in the market for a new complete 300BLK upper. I had a complete AAC MPW 9" that I had to send back, when I finally got around to putting a suppressor on it and we found out the barrel threads weren't concentric. Remington, the new AAC, said just send it back in and we'll put a new barrel in it for you and send it back. Well, they've had it for roughly 4 months and I get a call and they tell me they can't fix it. The remaining barrels they have tried won't shoot consistently and they're not doing any more new ones. They will be sending back my lower without an upper and giving me some sort of refund for the upper. I'm not exactly happy about the situation but at least I get my registered lower back. I've been looking for complete upper and other than a KAC on GB they've been limited at best for nice setups and it's $1,800. Should I be looking just to build one or does anyone have suggestions of where I may be able to find a quality built 9" upper?