Maxx Aluminum Hop-Up Chamber for M4/M16 AEG Gel Blaster You'll need a tracer unit

You'll need a tracer unit compatible with green BBs

offering users a high degree of control

ensuring consistent velocity and performance tailored to your gun's setup or field rules

5"     17

with adjustable straps to accommodate various body sizes

Maxx Aluminum Hop-Up Chamber for M4/M16 AEG Gel Blaster You'll need a tracer unitAbout the Maxx Airsoft V2 CNC Aluminum Hop up The Maxx Airsoft V2 CNC Aluminum Hop up is a precision CNC machined hop up unit for an airsoft m4. This hop up unit retains the 4 5 BB's that normally fall out of your gun when the magazine is removed. What's Included In The Box: Maxx Airsoft V2 CNC Aluminum Hop up Quick Overview CNC Machined Aluminum Numbered Dial for Easy Adjustment Multiple nubs Included Specifications & Dimensions: Overall Length: 51.