This should cost way more - TRYBE Defense AR-15 5.56x45mm NATO Upper Receiver

Beyond impressed with this, especially for the price point. Took it apart expecting to have to lap the receiver and bed the barrel, but the barrel and receiver were flush and the barrel was already bedded. I've taken apart uppers that cost 3x this price or more and had to do those things. On top of that, I'm a fan of having a heavy barrel on a 10.5" build for heat dissipation. Would not hesitate to buy this again.