HMU if you have: Upgraded hi capa build Stock hi capa (tm or aw) Am slides Boneyard hi Capa Hi capa parts (grips, frames, slides, hop up stuff, bbu etc) Hi capa drum mag Hpa tank/regulator HMU if you want to buy/tr@d: Custom hi capa build, built to order, can go however extreme as you wish One of my prebuilt hi capa builds