PolarStar UGS™ Stock Rail Type:Original HPA (Limited) The rotational top threaded cap

The rotational top threaded cap provides the flexibility of choosing the optimal location for the gauge and fill nipple

Compact high-performance tracer with quick activation and strong illumination

02mm inner barrel for AEG/GBB

Jogger Fit + Stretch Waistband Athletic tapered leg and heavyweight stretch waistband with custom HK Army drawstring

Metal upper frame w/ front and rear cocking serrations

PolarStar UGS™ Stock Rail Type:Original HPA (Limited) The rotational top threaded capThe UGS Stock Rail provides the indexing and length adjustment normally handled by the rail on a buffer tube. Swap between rails on your UGS to reconfigure the stock for Milspec CO2 inserts and Milspec stocks, or 2. 000" diameter HPA tanks and 2. 000" stocks such as the G&P R3 and similar paintball style stocks. All UGS stocks for M4 series models use the Original rails. All UGS stocks for HK417 models use the R01 rails. Milspec Diameter, Original HPA