Element Hop Up Unit | AEG M16/M4 Airsoft Hop Up
The Element Level 3 airsoft Hop-Up Unit for M4 / M16 is a one piece plastic hop up unit. If you are looking for an inexpensive airsoft hop up, that still has great air seal, then this hop-up is for you. Since this hop up is made of plastic it can have an o-ring where the hop unit inserts into the gearbox.