JG M4 Metal Hop up Chamber

Your hop up chamber is reponsible for holding your barrel, hop up nub, and hop up rubber in place, and provides consistency. The better quality the chamber, the better the consistency i.e. you're controlling the hop up arm (the piece that presses into the hop up rubber), and holding everything together in a sealed package.

These hop up chambers are metal, so provide additional durability over standard plastic chambers. They're a cog-based design, so can be a little more awkard to adjust than the rotary style

Changing your hop up chamber requires disassembly of your replica - you also have to disassemble your current barrel/hop assembly. Doing so risks tearing your hop up rubber, so bear that in mind. If you're at all unsure, please seek the aid of a professional