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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. •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 •Please allow 3-5 days for shipment •Please allow 45-60 days for shipment of color pieces •F-1 Firearms' Color Anodizing Disclaimer: We at F-1 Firearms and our 3rd party anodizing partner try our very best to ensure the highest in quality with regards to our color anodizing. However, our color anodizing is Type II (0.0002" – 0.0012” in thickness) which is a sulfuric type of application. Type II anodizing can only be expected to withstand normal wear and tear and F-1 Firearms cannot be held liable for longterm fatigue. The color anodizing process is not a 100% color match every time thus it is expected that their will be some slight color variations in the anodizing and F-1 Firearms cannot be held liable for said variations.