I have a Sai GRY I’m looking to sale. It has a polarstar Kythera with a polarstar UGS stock with the milspec CO2 insert. MAXX HopUp Orga widebore Flat Hopped Sig Romeo Optic Magpul Stock SureFire replica mini scout Haley strategic flashlight mount Gun has never let me down. Built it for miles I’m events but have used it indoor as well. The Kythera is very consistent and with the CO2 you are restricted with a hose. I have more pictures and can take videos for you. Let me know if you have any questions.