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Things I liked: Fills up quick and lasts for the entire clip.
Things I would have changed: Gas release valve is way too sensitive. Sometimes caused gun to fire when using the decocker on the pistol.
Things I liked: It's all metal which has a nice heft and feel to it. HI FLOW VALVE! That means increased FPS and blowback kick.
Things I would have changed: The price should be a little lower.
What others should know: Even though it is expensive for just one magazine, an extra mag in a battle is invaluable. If you just use your P99 for backyard shooting, I don't recommend it because of it's price tag.