M4A Pro MAXX CNC Aluminum Hopup Chamber for AEG Airsoft Guns

***The Dual UV LED Tracer Module is an add-on option to glow BB in the dark. Operating Voltage from 7VDC - 15VDC (2-4 cells LiPo, 6-13 cells NiCad). (Sold separately)***Test results: FPS might be increased from 10FPS to 30FPS over the stock setup. Please check your FPS! Features Machined from a solid aircraft aluminum block with tight tolerances to achieve the most accuracy, consistency, and durability Performed accurately and consistently on Tokyo Marui (include G&G, KRYTAC, except KWA) Standard M4/M16 AEG series Precision Rotary Dial Knob for fine hopup adjustments Re-engineered the precision Hopup Lever and 4mm Bucking Nubs (6mm Bucking Nubs are optional) to perform best with R-Hop and Standard-Hop to keep the BB shooting accurately and consistently on every single shot Removable Steel Pivot Pin for ease of setup and maintenance Accepted 21.00mm to 21.25mm nozzle length Fully compatible with most aftermarket soft and hard rubber buckings without losing FPS or d