Did you mean

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Hey, it's not the size, it's how you use it!

Oh, I see what you mean...I'll edit that.
Horses for courses. 90cm is long for the UK (good for clearer water like Cornwall) -- I suspect 75cm would be a be better all round size though, as too often I can't even see the end of my spear

. I am thinking of getting a 70cm gun - although I am yet to be convinced you can see fish in such poor viz.
Did you take a rubber off your Tuna gun or was that how it came (I think Sumora in the US - & pos. Adrenaline in Oz? - may spec. their guns a little differently -- Sumora even put their name on the barrel).