Bullets are an absolute necessity if you short stocks. I could not imagine life without them. I use them on 4 to 5 different stocks a day. You use them to short downticks, that simple.
With a bullet you can hit Sell instead of Short, which is good on Nasdaq stocks but absolutely essential on NYSE stocks.
All pro firms will have them, but when you call the firms, ask if they are electronic or if you have to call them in. You only want to go with a firm that has electronic bullets.
You can enter the amount of shares you want on your screen and get filled in less than a second. It's instantaneous. So if you see something, you click the bullet then hit the bid. Ask anyone at a pro firm if they use them, everyone I know does.
I looked around, Echo is the cheapest. I pay 3 cents per share to get the bullet on, then you just pay normal rates to trade after that. So if you want to scalp 100 AOL all day, in the morning it will cost you $3.00 one-time when you buy the bullet, then you can sell it short on downticks all day, and every time you do you only pay the normal 1 cent per share rate.
Yes, you can get them before the opening and sell short the opening print.
You have to try them once and you will be hooked. Anyone who says you don't need them has never tried them.
-Jim