| ^how did you get it?!
ps yes it is. M is an extra button above the "L" trigger that is present only on 3rd party controllers (you know, like the ones with turbo.) it's actually used for games to, it has the same function as Z. here's a link to a pic:
http://ecx.images-amazon.com/images/I/21p-ZDQyBaL._SL500_AA150_.jpg
look closely above L and you'll see another Z-looking button |