AR Platform

Jacob Grey Custom (M4) Billet Upper and Lower Receiver Set. CNC Machined Aluminum.

Machined to the Tightest of tolerances on 5 axis Aerospace machines. Designed to provide a more Rigid shooting platform than other Receivers while still saving as much weight as possible.


  • Billet 7075-T651 aircraft aluminum
  • Upper and lower are a match set
  • Expanded trigger guard
  • Ambidextrous safety markings
  • 6-32 threaded bolt catch screw
  • Forward assist delete
  • Full picatinny rail
  • M4 feedramp cut

Finish options:

  • Sand blast finish
  • Raw
  • Black hard anodize


  • Caliber: Multi (will accept any upper and/or caliber designed for the AR-15 platform)
  • Magazine: Accepts any standard MIL-SPEC AR-15 magazine
  • Precision broached magazine well with beveled feed lips
  • Caliber marking of “Multi” so it can be used with different caliber uppers
  • Compatible with all standard AR-15 components and magazines and most aftermarket parts
  • Integrated large opening “winter” trigger guard
  • Manufactured to MILSPEC


  • Made in America
  • Requires shipment to licensed FFL dealer. This is a serialized item considered to be a firearm by BATFE. All BATFE, GCA & NFA rules apply.

What Our Customers Are Saying

  • If you ever shoot one, that is the moment you will begin to covet that which you are holding. Yes, I have shot one. One time. It was enough to let me know I’ve got to have one."

    James Watford, via Facebook