The H&K CO2 Airsoft Pistol is a full sized replica of the real H&K USP. It shoots at an impressive 360 FPS with 0.20g BBs and comes with officially licensed H&K Trademarks. With a functional safety and drop-free 16 BB CO2 magazine, this pistol is an affordable and accurate sidearm for any airsoft player.
Currently this is what I'm running for a sidearm. I wasn't expecting much based on the price and all plastic construction. But for the price, it's actually pretty good! Surprising weight in your hand (a good thing). It's extremely accurate for a pistol in this price range (seems to like .2 bbs most), however I don't believe that the hop up is adjustable, at least not without disassembly, which is a huge pain since it doesn't break down like other gbb pistols. This is a large pistol, and the grip may be too big for small hands, but if it fits in yours, it isn't going anywhere because it's extremely well textured. The trigger guard is large enough that you can easily use it with gloves on. The location and operation of the magazine release is placed in such a way that you won't accidentally loose your mags when it's holstered. The only downside is the lack of blowback. If you really need a sidearm, and you're on a budget, definitely take a hard look at this.