F-1 Firearms UDR-15-3G Stripped Billet Upper Receiver - Black

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

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The F-1 Firearms UDR-15 Universal Upper Receiver is the best of both worlds. The upper receiver is made with 7075-T6 aircraft quality domestic Aluminum ensuring quality and offers the signature F-1 Firearms 3G skeletonizing for reduced weight and aesthetics. This upper receiver is also universal which makes it compatible with any MIL-SPEC lower out there.
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BrandF-1 Firearms
Feed RampsM4
FinishHardcoat Anodized
Forward AssistIncompatible
Port DoorNot Compatible
Receiver Material7075-T6 Aluminum
T MarksUnmarked

Ratings & Reviews

3 reviews

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Super light and incredible looking!!!!


This is the lightest upper I have ever seen. The tolerances of the fit (pins, bcg) are really tight fitting and the coating is decent. Given the cutouts, it is quite sturdy and matches well to forged lowers too. Tried a Gen 2 Aero Precision lower and has zero wobble (like matched billet). Get a Fortis 12" lower to go with and your AR will be both 3gun and Gun Show ready!

Perfect fit

by -

I matched this with my Spike's Tactical lower and it's a perfect fit. A few others have a tiny bit of wobble but not the F1. Very happy. And primary arms has the best price!

Looks cool and does the job

by -

This is a great upper. Very light weight. Looks cool with my golden colored Bcg (forgot the correct terminology but it's obviously not real gold lol). My only complaint is that the black finish comes off too easy. I'd understand if It was cheaper, but for that price, I expected perfection.