Grey Ghost Precision Cornerstone AR-15 Lower Receiver

Manufactured by Grey Ghost Precision
Manufactured by Grey Ghost Precision
2 Reviews

In Stock

Standard orders will ship out in 1 business days or less if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination. NFA items will take longer to ship and are dependent upon ATF processing times.

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Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal-Firearm License holder.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to



The lower receiver is the cornerstone of any AR build. A lack luster lower can vary widely in final specs and negatively impact your build's reliability. Start your AR-15 build off with a solid foundation using Grey Ghost Precision's Cornerstone stripped lower!

  • Precision machined to within +/- 0.001" tolerances
  • Cut from high strength 7075-T6 aluminum forgings
  • Hardcoat anodized black finish with 60 Rockwell surface hardness
  • Flared magazine well for faster reloads
  • Pictographic Fire and Safe indicators
  • Nylon-tipped receiver tension screw

A proper MIL-SPEC lower receiver's dimensions can vary over .005" or more from one receiver to the next. This is fine for a military rifle, but these tolerance errors can stack up, impacting parts compatibility, fit, and function, especially when using aftermarket components. By comparison, the Cornerstone lower receiver is machined to exceptionally tight +/- 0.001" tolerances, allowing for incredible consistency. To further increase accuracy, this lower features a nylon tipped tension screw, ensuring your upper and lower fit together without rattle.

With an extensive military and manufacturing background, and an impressive network of industry and shooting experts, Grey Ghost Precision has pushed on to create not just exceptional firearms and accessories, but make sure those products are accessible to shooters everywhere. They also fully stand behind their products, with a limited lifetime guarantee!
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BrandGrey Ghost Precision
Caliber MarkingMulti-Caliber
FinishHardcoat Anodized
Receiver Material7075-T6 Aluminum
Trigger Pin DiameterMIL-SPEC .154
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

2 reviews

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Clean receiver


One of the nicest stripped lower receivers I have seen. Clean, excellent fit and finish. Great attention to detail.

Excellent quality


This lower had the best fit and finish I have ever seen. The anodized finish is a smooth, deep black and the fit to my uppers is excellent.