[Ricochet]

There's usually a standard set of guidelines for rebuilding each mechbox version, when dealing with hop-up designs, and for maximizing performance. That being said, it takes some experience to be considered "advanced". For instance, aV2 mechbox generally has a method for shimming gears, and greasing, but an experienced gun doc will notice little bits of wobble or unbalance, and adapt appropriately for each individual gun.

Describe in detail the project, and the parts you want to use and why, and you'll get a better description on what to do. Some hop-ups and barrels work well together, and certain pieces have very unique but common mods that are done to them. Even a solid motor and appropriate battery combo will make a difference.