The JG M4/M16 Lower Receiver may be a replacement receiver for your used or damaged M4 lower receiver. The JG receiver comes in black color which has become a well-liked color to use by most avid Airsoft players. the merchandise is formed of a durable polymer construction providing durability. Professional installation of upgrade parts is very recommended. This part should be compatible with most gearboxes, but can’t be guaranteed by TACTICAL.