PolarStar CGS™ Stock System

The PolarStar CGS™ lets you run a high-performance HPA system with the realistic appearance of a standard Milspec buffer tube — no airline tether, no tank screwed into the back of your rifle. Machined from a real Milspec buffer tube blank, it conceals an adjustable regulator and CO2 cartridge while remaining compatible with all Milspec AR stocks.

Its integral regulator shares the same proven internal design as the UGS™ and Micro Reg GEN2, delivering 40–130psi output adjustable with a 3/32 allen key and lockable with a zip tie. Optional High Pressure Spring (p/n 10000692) boosts maximum output to ~200psi.

CO2 Inserts

Swappable 12g and 33g CO2 inserts feature an integral expansion chamber, anti-siphon system, 5-micron filter, and check valve to prevent liquid CO2 from entering the regulator regardless of rifle orientation. The check valve also conserves CO2 during combat reloads.

• 12g insert: ~180 shots at 1.5J / .28g / 6.05×380mm barrel (with F2™)
• 33g insert: ~500 shots at the same settings

Configurations

• Type 1: For AEG receivers accepting 1-3/16"-16 threaded buffer tubes (gearbox modification required).
• Type 2: For traditional TM Spec M4 receivers (receiver and gearbox modification required).

Features

• Machined from a Milspec AR buffer tube blank
• Compatible with Milspec AR stocks
• Simple zip-tie tournament lock
• Only 2 o-rings — easy to maintain
• Works with F2™, JACK™, Kythera™ and other HPA cylinder systems
• Not compatible with Fusion Engine™

Specifications

• Min Output Pressure: 40 PSI
• Max Output Pressure: 130 PSI (~200 PSI with HP Spring, p/n 10000692)
• Max Input Pressure: 900 PSI
• Outputs: Interfaces w/ Airline (6mm OD x 4mm ID)
• Warranty: 1 Year Limited

CO2 Cartridges & HP Spring not included.