This is a thing you need to take in to consideration when upgrading your rifle.
As this will matter if you’re going for a rifle with the best parts for the desired fps and bb weight.
Now i will go over 4 things in this guild, that being.
1. The energy transfer.
2. Joule creep.
3. Barrel ratio.
4. How the weight of piston affects this.
5. HPA and joule creep.