A USP AEP version in the form of the CYMA CM.125 AEP is available in the market and Geonox Airsoft takes a look at one if it's a good alternative to a gas blowback... "In this video I present the CM.125 from Cyma and show you what I like and what I don't like about the Airsoft. We have already looked at the CM.030, the CM.127 and the CM.126. Here we have an AEP in HK USP design. Which of these models you take is a matter of taste. Internally they are all very similar and the shooting performance is very similar. However, what you have to consider is that there are two versions of each model, Gen 1 (NIMH) and Gen 2 (LIPO and Mosfet). CM.125 Gen 1 (NIMH version) including battery and charger."