EVERYTHING YOU NEED. NOTHING YOU DON'T.
The M4 forged receiver from JMac Customs is a M4 / AR-51 mil-spec receiver without the extra nonsense to drive up price and get in the way. It features all three selector markings, and has a pocket for those out there with a RDIAS in the safe. The 7075 Forged Aluminum is Type 3 Hard Coat anodized, following the industry standard from other high end lower receivers.
For those looking for a clean, high end receiver with no unneeded gimicks- the JMac M4 receiver is here.