S&T Replacement Valve Set for M4 / M16 Series Airsoft GBB Magazines chest rig Gun includes a mosfet ETU

Gun includes a mosfet ETU system for 11

For airsoft use only - AAP from Action Army

The Hopup Chamber EVO unit is built with a Precision Aluminum Rotary Dial Knob for fine hopup adjustments and equipped with 4mm Flat Soft Bucking Nub (6mm Bucking Nub is optional) to perform best with R-Hop and Standard-Hop to keep the BB shooting accurately and consistently on every single shot

Extended magazine that holds 55 rounds for extra firepower for when you need it

S&T Replacement Valve Set for M4 / M16 Series Airsoft GBB Magazines chest rig Gun includes a mosfet ETUBrass construction Factory OEM replacement parts Fits most WA WOC pattern Airsoft M4 GBB magazines Material: Brass, RubberCompatibility: For G&P, King Arms, JG, Matrix and other compatible M4 M16 Series Airsoft GBB Magazines