[devbro]

as long as your cylinder size is compatible size to your inner barrel, port location won't be the issues. a few things you can check for a good air compression:
1. check the nozzle air seal while moving it
2. check the length of your air nozzle. if it is too short, it may not be making a good seal. check air coming out of mag part of hop up while you shoot.
3. check your hop up, it would be the next point of leak, specifically the rubber

I went from M100 to M110 and my fps went up from 300 to 340.