Madbull Noveske Rifleworks Adjustable Gas Block for M4/M16

Noveske licensed stealth black smooooth gas block design; on a real steel weapon an adjustable gas block is used to tune the gas calibration on the sometimes ammunition-load sensitive ARs, for Airsoft its serves no function other then to look cool, just another little something to make your M4 / M16 stand apart from the crowd.