F-1 Firearms UDR-15 3G Style 1 Skeletonized AR-15 Receiver Set

SKU: UDR-15-3G-1-SET
MPN: UDR-15-3G-1-SET
Manufactured by F-1 Firearms


In Stock

"We ship fast!" Order by 4PM CST M-F or 11AM CST Saturday and your order ships same day. FFL items may take longer to process.


In Stock

Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal Firearm License holder.
•Current processing time can be 1-3 days.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to ffl@primaryarms.com.


The F-1 Firearms UDR-15 3G Style 1 AR-15 Skeletonized Receiver Set is the foundation you need for building a lightweight competition rifle. The upper and lower receiver are machined from a billet of 7075-T6 aluminum as a matched set to ensure precision fitment. The magwell and upper receiver are skeletonized to reduce unnecessary material without sacrificing strength and gives your build a unique aesthetic. The magazine well also features a 60° bevel to improve reload speeds and the integral trigger guard has been enlarged to accommodate gloved use and is much stronger than standard roll pin trigger guards. This F-1 Firearms Skeletonized Receiver Set is great for your next build.

  • Matched billet set machined from 7075-T6 aluminum
  • Hardcoat anodized black
  • Fully skeletonized
  • Scalloped picatinny rail
  • Oversized integral trigger guard
  • 60° beveled magazine well
  • Includes front and rear takedown pins
  • Includes threaded bolt catch screw, receiver tension screw, and takedown pin detent

Additional features of this AR-15 receiver set is a receiver tension screw, threaded bolt catch roll pin, and threaded takedown pin detent, to make installation easier. The lower and upper receiver are type III class 2 hardcoat anodized for additional corrosion and wear resistance.

F1-Firearms is a Texas based manufacturer of high quality AR-15 and AR-10 rifles. They are known for their fully skeletonized receivers that reduce weight without sacrificing strength and highly accurate 416R stainless steel barrels. Whether you are building your own or buying a prebuilt, F1-Firearms has the competition rifle for you.


BrandF-1 Firearms
Caliber MarkingMulti-Caliber
FinishHardcoat Anodized
Receiver Material7075-T6 Aluminum
Trigger Pin DiameterMIL-SPEC .154
Forward Assist
Port Door

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see www.p65warnings.ca.gov

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