F-1 Firearms new UDP-9-3G skeletonized pistol caliber carbine (PCC) is a collaboration with PCC powerhouse Quarter Circle 10 (QC10). Utilizing the proven QC10 Small Frame Glock Lower Receiver, coupled with F-1 Firearms finishing touches; the UDP-9-3G flaunts the skeletonizing and cutting-edge design techniques that F-1 Firearms has become known for throughout the industry. Situated on top of the F-1/QC10 skeletonized lower is our new UDP skeletonized upper receiver; designed to cosmetically flow directly into our new ultralight P7M rail system available in 5”, 7” and 13” lengths. The UDP-9-3G line is available in multiple configurations and colors. Call or view online for complete offering of optional upgrades.