The S226 S5 from KWC is based upon the popular P226 X5 as produced by Sig Sauer, and the KWC model is an excellent replica.
The frame is constructed from full metal, which gives it a mega realistic feel, and well as dealing with the positive blowback very well. The trigger is crisp and light, so you can always be on target before you fire that shot.
The magazine drops out from the pistol grip, and houses the co2 capsule, as well as the BBs for quick and easy reloading. The rear sight is full adjustable, and there is a weaver rail below the barrel for mounting accessories such as torches and lasers.