It's a custom m4 and when it's done it should be set with 12:1 shs gears G&g bevel(cause they're stronger) Custom torched cylinder Shs red tappet nozzle Shs custom cut tappet plate Shimmed Aoe corrected New trigger contacts New trigger Devil airsoft m110 spring I believe Classic army hightork motor Zeus mosfet 11.1 lipo Firehawk upper and a cm16 upper, both with brand new hop up kits and barrels Hit me with whatever offers you got, polarstar im interested in with line and tank and reg, and I can sell