For the URF-F (Upper Receiver, FCD, Forged), there is but a single functional change which differs from the TDP spec forged upper receiver. Specifically, URF-F has relief cuts/chamfers on the area above the charging handle (before 1913 rails start) for better accessibility of a flip up BUIS's sight stalk / flip up element. In 2023, FCD also added another bevel in the rear.
NOTE: these are the new version of the URF-F, The major difference is the presence of anti-rotation pin hole for HDSI, SOLGW and ZEV handguards.
URF-F is based on TDP spec forged upper receiver, it's made and modified for Forward Controls. Type 3 hard coated in black. Like TDP spec A3 upper receivers, URF-F can accommodate a forward assist, but does not come installed with one.
Features
Machined from aluminum Forgings 7075-T6
Hardcoat Anodized per MIL-A-8625F, Type III, Class 2
URF-F does not require thermal fit, and dos not have rail numbers (otherwise known as T numbers) on top, two features we don't deem useful.
Like all FCD products, URF-F is proudly made in USA.