N/A Throne Gen 2 customizations

I just bought a Gen 2 Throne Compact from Reximex and wanted to ask here if someone know if i could upgrade it to a bigger bottle for more shots per fill (if so which one would you reccomend) and as well if you could swap to a normal diameter Gen 2 Throne barrel if i wanted to shoot at larger distances
 
To my knowledge Reximex sells barrel kits.
As for if they do in the US or UK, no idea.

What they don´t sell though, pity to say, is 100cc plenums.

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Them you´ll have to make yourself.