I've been looking for an airsoft platform to train on, and there's a lot of opinions to compliment my full sized M&P9. I've read a lot about the atei costa slide on the Tokyo Maryui frame and the Salient Arma SAI airsoft. But beyond the limited "airsoft" culture, I'm clueless. About a $500 budget and end desireable goal is an M&P styled airsoft, trademarks and slide cuts if possible, but #1 priority is heavy kick and good trigger. I understand it's possible I'll get zero responses! Any suggestions?