Polarstar JACK HPA Version 2 Conversion Kit for M4-M16 w- REV3 FCU taran tactical Description: The KWA KM4 SR7

Description: The KWA KM4 SR7 is based on a highly modified M4 variant developed for the US Naval Special Warfare Development Group

See-Thru Mount

Motor: Long Type

PolarStar Fusion Engine AK Green Nozzle FE Nozzle Type: AK Series Build Material: Aluminum Color: Green Bore Size: 0

– Inner Barrel Diameter: 6

Polarstar JACK HPA Version 2 Conversion Kit for M4-M16 w- REV3 FCU taran tactical Description: The KWA KM4 SR7Description: Polarstar JACK HPA Version 2 Conversion Kit for M4 M16 The JACK system was designed to answer the demand for an affordable, high performance HPA (High Pressure Air) conversion for AEG's. The system is a drop in cylinder replacement that is universally compatible with a wide range of gearbox versions that have center line nozzles. Similar to its sister product, the F1, it replaces the original gearbox components with a programmable