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.

- UDR-15-3G universal upper receiver
- Manufactured from high grade 7075-T6 billet aluminum
- Unnecessary surfaces milled out for lightest reliable configuration
- Black - Type III Class 2 hard anodizing
- Colors - Type II hard anodizing
- F-1 Firearms 100% Product Guarantee
- Weight 6.7oz ***You can NOT install a forward assist or ejection door on these receivers.