Latest review from Aderron Airsoft... "Of all recent airsoft guns released from clone companies, the S&T Tavor-21 has probably received the most crap from internet haters; but I'm going to have to go against the grain and say it's not that bad. It does have a polymer gearbox shell, which is a bit unconventional, but not unheard of. Companies like ARES and STAR have been known to use plastic gearboxes without any catastrophic issues.