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Gen 4 Forged Lower HUUCR

Inventory: Out of Stock
Price: $150.00

Hard Use Umbrella Corp Receiver. It's how we designate a receiver that might not be the prettiest thing to look at, but it gets the job done like a pro. You don't take these home to momma, you spend a few bucks and use them like the HUUCRs that they are. As Umbrella blems, they may very well look better than other manufacturers' standard parts. These lowers could have some dents, dings, and anodizing issues but it's all cosmetic. Our standard lower receiver specs apply including our patent pending grip chamfer, extreme magwell bevel, our deep laser engraved umbrella logo along with a new surface mark to designate these as HUUCR lowers. Assembly by a qualified Armorer is required.


  • Precision machined from Aerospace 7075 Aluminum Alloy forging, T6 Temper
  • Certified MIL-A-8625F, Type III, Class 2, Hard Anodic Coating, Flat Black Dye, Non-Reflective, NiAc Seal
  • TDP/Mil standard take down and fire control pin dimensions
  • Chamfered interface for ease of aftermarket grip installation (patent pending)
  • Kaiser chemical composition certifications for the 7075 Aluminum
  • Cerro Fabricated Products certifications for raw forgings verifying physical properties and aged condition
  • Anderson Laboratories independent analysis verifying both Kaiser and Cerro's specifications
  • Post machining operational reports
  • Precision broached magazine well
  • Dimensional accuracy inspection
  • Sharp edges meticulously de-burred by hand
  • Inert media blast for uniform finish
  • Archaic selector stops machined away
  • Pictograph selector markings w/full auto umbrellas
  • No caliber specification for build versatility
  • AR-15 classic model designation
  • Text and logo high power laser engraved prior to anodize
  • Deep magwell bevel to the limit of a standard forging
  • HUUCR designation surface mark
  • All components, material, and packaging made in the USA
  • Fourth Generation

 Forged Parts Kit option includes the following components:

  • Pivot Pin
  • Pivot Pin Detent, stainless steel
  • Pivot Pin Spring, 17-7 PH stainless steel
  • Takedown Pin
  • Takedown Pin Detent, stainless steel
  • Takedown Pin Spring, 17-7 PH stainless steel
  • Bolt Catch, S7 shock resistant tool steel
  • Bolt Catch Roll Pin
  • Bolt Catch Plunger
  • Bolt Catch Spring, 17-7 PH stainless steel
  • Magazine Button
  • Magazine Catch
  • Magazine Catch Spring, 17-7 PH stainless steel
  • Buffer Retaining Detent
  • Buffer Detent Spring, 17-7 PH stainless steel
  • Selector Detent, stainless steel
  • Selector Spring, 17-7 PH stainless steel
  • Battle Arms BAD-ASS Ambi Selector (90° throw w/long & short standard levers)
  • Hammer Spring
  • Trigger Spring
  • Disconnector Spring
  • Hammer Pin, 4140 chromoly steel alloy
  • Trigger Pin, 4140 chromoly steel alloy
  • ALG Defense QMS Hammer, mil-spec 8620 alloy casting
  • ALG Defense QMS Trigger, mil-spec 8620 alloy casting
  • ALG Defense QMS Disconnector, 1070 high carbon steel
  • Trigger Guard Roll Pin, 1070 high carbon steel
  • B5 Systems 6061-T6 Aluminum Oversized Trigger Guard
  • Umbrella Grip 23
  • All components, material, and packaging made in the USA

As with all Umbrella products, these kits are made to the finest standards and carry an unconditional guarantee against material defect and manufacturing failure. Assembly by a qualified Armorer is required.


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. 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.

We do not send out emails to tell you that we have received your dealer’s FFL. That would require hundreds of additional emails on top of those already going out. You will know that we have your dealer’s license when you get the tracking info for your lower receiver. Likewise, if we have an issue or don’t have a FFL from your dealer, we will contact you when we get to that point. And if your dealer is one of those that require a phone call, our license first, or some other such nonsense before they will send us their FFL, please find another dealer.