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

Manufactured by F-1 Firearms
SKU: UDR-15-3G-1-SET
MPN: UDR-15-3G-1-SET
Manufactured by F-1 Firearms
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NOTE: Limit 3 per household. Quantities exceeding 3 will not allow checkout.

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 is approximately 14 to 16 days.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers. Due to Covid-19 many are no longer open
•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.
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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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