Profile wise, what is the smallest available bottle in the UK that I could use on an Invert Mini? Bear in mind when I say small I don't mean ridiculously small, I'm trying to achieve a good balance with the mini's size juxtaposed with the bottle's.
If you did want silly small, ninja paintball make a 13ci tank which fits inside milsim stocks, thats about as small as air gets! not sure if they do pi marked bottles though, may just be DOT.