The UCP HK operates by roller-delayed blowback. The external design of the weapon appears to have been borrowed from the P2000, including ambidextrous controls, interchangeable backstraps, and a MIL-STD-1913 Picatinny rail for accessories. Similarly to the P2000 and the USP pistols, the UCP’s trigger mechanism was modular, making it capable of different configurations.
The UCP HK could accept an extended, threaded barrel capable of equipping a silencer made by Swiss firearms manufacturer Brügger & Thomet.
It was designed to be the companion sidearm to the MP7 PDW, using the same 4.6×30mm bottlenecked cartridge. In this sense, the UCP HK was a competitor to FN Herstal’s Five-seveN in the same context that the MP7 rivals the P90.
Type: Double Action
Weight unloaded: 850 g
Length: 200 mm
Barrel length: 130 mm
Capacity: 20 rounds