UGS™ MODEL:UGS TYPE 1, 33g CO2 (RS SPEC) – CO2 Insert Included The original HK417/G28 stocks use

The original HK417/G28 stocks use a larger diameter buffer tube and therefore cannot be used on the CO2 inserts

Similar to its sister products

It is not compatible with variants of the V2 gearbox which use a snap-action/microswitch trigger such as in the Ares V2 gearboxes

EF/ARES G36KV/CV

Dual solenoids allow for the nozzle and the poppet valve to be adjusted independently of each other for unparalleled control over both the loading time and air volume used

UGS™ MODEL:UGS TYPE 1, 33g CO2 (RS SPEC) – CO2 Insert Included The original HK417/G28 stocks useWith the PolarStar UGS (Universal Gas Stock) you can now get the performance advantage of a HPA system without needing to be tethered to a remote air rig and still retain the likeness and function of a traditional adjustable AR 15 stock. It can be used with any of the PolarStar cylinder conversion kits such as the F2, F1, JACK or Kythera and is compact enough that it can also be used with other similar HPA cylinder systems on the market. Its integral