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Billet Lower Receiver 7075

Inventory: Out of Stock
Price: $350.00

While our standard production billet lowers will be crafted from the unique 7068 aluminum, this material has an extreme lead time for production quantities. So, to get the billet design to market, our initial lowers will be manufactured from the Mil standard 7075 alloy, aged to T651 condition, while we wait for our custom 7068 extrusions. No matter the material, Umbrella Corporation AR-15 premium billet lowers are created on GF AgieCharmilles 5-axis Mikron high performance machining centers and held to incredibly tight aerospace tolerances. Our flagship receiver, it's made to the finest standards without regard to cost. These lowers carry an unconditional guarantee against material defect and manufacturing failure. Assembly by a qualified Armorer is required.


  • Precision machined from billet Aerospace 7075 Kaiser Aluminum Alloy, T651 Temper
  • Certified MIL-A-8625F, Type III, Class 2, Hard Anodic Coating, Flat Black Dye, Non-Reflective, Nickel Fluoride Seal
  • TDP (Technical Data Package) standard take down and fire control pin dimensions for universal build versatility
  • Integrated trigger guard, undercut and relieved for more comfortable hold, generous opening accommodates gloved operation
  • Redesigned mil-spec magwell geometry increases strength, provides larger funnel, improved debris clearance, and supports over-insertion stops on polymer magazines including Magpul's new M3
  • Accepts SureFire High-Capacity 60 & 100 rnd aluminum magazines 
  • AXTS A-DAC patent pending technology engages bolt catch by pressing magazine button (not a bolt release)
  • Includes A-DAC specific parts: bolt catch, mag button, mag catch spring, and actuator pin
  • Includes supplemental mil-spec parts: bolt catch plunger, plunger spring, bolt catch roll pin  
  • Machined relief cut supports Battle Arms Development 45° short throw ambidextrous selectors
  • Beveled interface for ease of aftermarket grip installation (patent pending)
  • "7075-T651" engraved on grip interface for easy material identification
  • Counter bored grip screw hole threads for clean interior transition
  • Limited production for the 7075 material (~400 units)
  • CMM dimensional accuracy inspection
  • Inert glass media blast for uniform finish
  • Unique pictograph selector markings cover both 45° and 90° throws
  • No caliber specification for build versatility
  • “AR-15 platform” model designation
  • Text and logo precision CNC machined prior to anodize
  • All components, material, and packaging made in the USA


NOTE: Umbrella Corporation only ships firearms and firearm receivers to FFL dealers. Customers may purchase from the website and have their dealer of choice email a copy of their license directly to with the customer's name in the subject line (as a matter of policy we DO NOT accept faxed FFLs). When you create your account or check-out, please enter your contact information/shipping address and not your dealer's. There are specific fields now for FFL transfer information and we will only ship your lower to the address of your chosen FFL. Any associated transfer fees assessed by the local dealer are the responsibility of the buyer and not UCWRG. Know the laws of your state or locale: Umbrella will not ship lower receivers to CT, DC, NY, or to restricted cities in CA, IL, MA, or MD. Please contact us directly if you have questions or require clarification.

Photos of assembled lowers are for reference purposes only; lower is sold stripped with only A-DAC specific parts to include bolt catch, bolt catch plunger, plunger spring, bolt catch roll pin, mag button, mag catch spring, actuating pin. Additional parts are optional and may be added at time of purchase. Fully assembled lowers are coming soon.