I guess the proper answer could be "Usually, reviews are read before the purchase is committed. After that, if the purchase proves to be wrong, it is too late."
The KWC Desert Eagle may be too powerful, but there are propane (green gas) mags for it. You'll need to chrono it to be sure. The pistol itself is all right. Not the best, being KWC, but if you wanted that badass Desert Eagle look, it was one of the only options beside Marui's one.
K3vX | Airsoft Gunsmith/Gun doctor in training.
Feel free to contact me in your preferred language and I'll gladly answer.