Check this out at RedWolf Airsoft... "The KSC P10 is a ­high quality and reliable version of the USP compact; it offers a light double action trigger with a crisp blowback and operation with decent power. Unlike the Real Steel P10, the KSC replica does not have a spurred hammer. This version is installed with the System 7 blow-back chamber, and will require System 7 compatible magazines.

The Heckler & Koch USP (Universelle Selbstladepistole, or "Universal Self-loading Pistol") is a semi-automatic pistol designed by the German arms manufacturer Heckler & Koch. 

Metal parts include:

• Slide Stop.
• Safety Lever.
• 24rd Magazine.
• Adjustable Front and Rear Sight.
• Trigger.
• Magazine Catch.

The safety is combined as a decocking lever - pulling it down all the way and the hammer uncocks automatically. Upgrading to metal slide and barrel (includes stiffer recoil spring) is highly recommended and gives this USP a very realistic and solid feel!

Please take note that only System 7 magazines will work with this P10."