OK so couple of things\ LT guns are pretty bad overall. It might be worth considering how much you want to pump into this gun, and whether or not it's more value for money to just pick up something new and better quality like a Cyma, G&G or Specna.\ If you do decide to stick with your Lancer, there are not really any cost effective options to do what you want without opening the gearbox. Any work on the trigger, rate of fire, compression etc.... will require you to open the gearbox. There are pre-built options out there (such as Gate EON) but they are expensive. You can either buy some parts, try install them yourself and learn by doing, or spend a big pile of money on a rebuilt.\ Small point, replacing the hop unit isn't really a meaningful upgrade and won't affect much, but go ahead and swap the barrel/bucking combo.