Run time Low: 90 minutes

QD swivel mounting attachment below buffer tube mount

Working Bolt Catch for Easy Hopup Adjustment

6mm CNC Silver magazine release

Our gearbox is tested wit M160 spring without any signs off wear or breaking long term

Speed Airsoft HPA M4 Standard Tunable Trigger Red USLR-A69361G Run time Low: 90 minutesThe new SPEED Airsoft HPA MOSFET M4 triggers released are designed to work with Polarstar HPA conversion systems. The SPEED HPA MOSFET M4 triggers incorporates dual adjustment set screws which will enable a trigger pull under 1mm with ease. The SPEED HPA MOSFET M4 triggers also includes a specially designed coil compression spring that reduces the pull tension, so players with the Polarstar systems can rip off lightning fast strings easily even in