So recently I purchased the A&K masada I was looking to do some upgrades into it. I was thinking about putting in a perun optical mosfet, shs 13:1 gears, shs high torque motor. I have the wii tech air nozzle, feeding chamber, and hopup coming in. After getting feeding issues right out of the box. I'm waiting to put my new 407mm 6.02 barrel when the hopup comes. I wasn't sure what cylinder set I should get though. Any other suggestions are greatly appreciated. I am relatively new to the sport (played on and off for a few years). This is the first gun that I am modifying. My past guns were just Crosman guns and a cm16 raider. Or should I leave the internals stock for a little bit until I have to change something in there?