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If I saw your edit before I posted, I don't think I would have posted at all LOL
Although it's not using propane, air is still a pressurized gas that decompresses the same way, it's just less affected by external conditions obviously. Because you control what pressure and air volume is used, you can make it have the FPS profile of a GBBR or of an AEG.
The reason GBBRs have high muzzle energy with heavier rounds is because they're using more gas volume than is required for the cylinder. They can't use more pressure since they're limited by the max pressure of what's in the mag. Of course, higher temp = higher pressure.
The BB takes longer to accelerate and is therefore in the barrel longer, and so as long as the poppet valve or gas valve is open, the same pressure is constantly being applied to the BB, and therefore constantly accelerating.
So like an AEG, if you had the exact air volume you needed to get a .20g BB out of the barrel at 1.6J, you wouldn't get very noticeably more muzzle energy from a .30g BB because the piston stops generating pressure before the BB has left the barrel, and what's applied is just whatever pressure is left as the air continues to decompress.
Sorry if it seems like I'm explaining it too simply, I just want everyone reading this to understand!
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