That is what I use to polish pistols with. Very good stuff!See also Mother's Mag Wheel Polish, which is available anywhere from Wal-mart to Autozone. Very similar stuff to Flitz, at least to my eyeballs. And way less spendy.
I went ahead and special ordered it from our local Ace Hardware. The sales person said he gets requests for it all the time.
Semichrome is better. Tried them both, no comparison.