Polarstar F1 HPA Conversion For M4-M16 w- REV3 FCU VFC Features: Original Madbull design Full

Features: Original Madbull design Full Metal Construction Quick load system Built-in easy access safety Built-in 20mm rail mount Works with 40mm grenade shells Easy installation Slim low profile design

24 /35 inch Barrel Length: 410mm Muzzle Velocity (0

Can Use Green Gas Magazine Or Co2 Magazine (Sold Separately)

The enlarged new heat-sink allows the Mosfets to cool even faster

Polarstar F1 HPA Conversion For M4-M16 w- REV3 FCU VFC Features: Original Madbull design FullWhat is the F1? Like the Fusion Engine and JACK, the patent pending F1 is a high performance HPA (High Pressure Air) system which replaces the traditional piston and gears of an AEG with a programmable pneumatic system. Flow Control The unique flow control system uses an integral check valve to regulate the forward speed of the nozzle while maintaining the fastest retract speed possible. This system is also what makes the F1's "2 stage" firing