UGS Type 2, HPA (TM Spec) - R3 Buttstock

The PolarStar UGS™ (Universal Gas Stock) is a game-changing solution for airsoft players who want the power and consistency of an HPA system without being tethered to a remote line. Designed to integrate directly into the buffer tube area of your replica, the UGS replaces the need for bulky setups while maintaining a realistic AR-15-style adjustable stock.

Compatible with all PolarStar cylinder systems like the F2™, F1™, JACK™, and Kythera™, and many other HPA systems using similar cylinders, the UGS features a compact, high-performance regulator with an output range of 40–130 PSI (up to 200 PSI with an optional high-pressure spring). The regulator can be tournament-locked with a simple zip tie, and maintenance is easy thanks to a minimalist internal design using only two O-rings.

You can choose from two main configurations:

• HPA Setup: Supports 13ci HPA tanks and 2.000" paintball-style stocks like the included G&P R3.

• CO2 Setup: Uses 12g or 33g CO2 cartridges with a modified stock rail, compatible with standard Milspec buttstocks.

Two installation types are available based on your AEG platform:

• Type 1: For receivers with a 1-3/16"-16 threaded buffer tube (e.g., G&P R3).

• Type 2: For traditional TM-spec M4 receivers (modification of receiver and gearbox required).

Key Features:

• Full HPA performance without a remote line

• Compact internal regulator with 40–130 PSI output (up to 200 PSI with HP spring)

• Compatible with 13ci tanks or 12g/33g CO2 cartridges

• Adjustable length of pull

• Zip-tie tournament lock ready

• Cross-compatible with PolarStar’s other compact regulators

• Maintenance-friendly design – only 2 internal O-rings

• Supports up to 900 PSI input (SLP tanks recommended)

Note: HPA tank, CO2 cartridges, and high-pressure spring are not included.