If you can find a Model 12 with a cutts comp tube/w chokes -- get it. NOTHING
is faster than a pump shotgun... not even automatics.
(The Low House/Doubles is far faster -- near instantaneous.)
But if you must
have a left-handed -- and if not a Model 12 -- then consider either an Ithaca 37
or a Browning BPS
Both are bottom eject so left/right doesn't matter