7
Found while tidying (Oveready shorty P60)
(lemmy.blahaj.zone)
18350 tube P60 twisty setup that was basically as small as you could get a P60. I never did get a nice head for it though.
Also pictured: the neat case/diffuser/bezel remover that shipped with EDC Plus P60 dropins.
The 3P would be a little bit bigger due to the clicky switch and longer battery tube. (But, in practical terms, yeah it's the same ballpark.)