Sorry I missed the non conversion part with the holiday cooking yesterday.
Can you post a picture of where the air tube meets the action(does it look like mine) ? Some of the newer dreamline guns have the bottle adapter and regulator with plenum and a screw on air tube with identical fittings as the fx bottle adapter. This means you may be able to just purchase a bottle of the dimensions you prefer with the bottle valve installed. Or you can buy a bottle valve and find a Chinese carbon bottle in lots of neat sizes and pick what best fits you. So long as the bottle is m18x1. 5 threads it will be a matter of screwing together parts.
The attached pic covers a few examples.
Top gun has a 360cc ali express cylinder that I converted the aea with. It was a tube gun.
Middle gun is dreamtact compact with (obscured) 300cc bottle.
Bottom gun is my money pit, semi useless slug shooting impact with a 580cc bottle for scale.
The 580 won't fit on my dreamline with the moderator.... Short barrel.
One of the more freeing things I ever did was have lots of large fill bottles and a compressor. I don't really worry about shot count per fill anymore if the gun can shoot at least a full magazine at high power. All 3 can shoot about 30 rounds per fill.
View attachment 522936 View attachment 522937