Selling a brand new Polarstar CGS CO2 stock. This is a TM Spec version (AEG buffer) with an included 12g CO2 insert -Regulator pressure range of 40-130psi -Machined from a Milspec AR buffer tube -Integral expansion chamber for consistent and efficient CO2 usage -Integrated tournament lock No Trades, no price negotiations, just simple transactions and really fast shipping. Flat rate shipping via USPS priority or UPS ground.