Element M4 / M16 Series Airsoft AEG Steel Selector Lever Switch

"worked great on my Dboys metal m4 the little catch pin works amazing good solid click stays in place To install it pop the little button shaped selector piece on the ejection port side of your gun and then you can get at the screw on the old one to put it on then just put that button pice back in place takes maybe 5 minutes and the gearbox must be removed from the lower reciever first