I have been thinking alot about this since the CP9 Arc, WHAT IS LUFFY'S GEAR 1?
First i thought that Luffy's regular self is his Gear 1, where is does Gomu Gomu no Pistol, Bullet, Wipe and Gattling
But then i thought that Luffy is not that dumb (HAHA i know) so he left that Gear 1 blank so he can feel it when he find a new fighting move, like now he uses Haki he can make his regular self 1000times stronger.
Thats my Guess. TELL ME WHAT YOU THINK.
P.S. I was a born bad speller so please bear with me, thank you.