I might be remembering it wrong, but I think bullets were popularized in the early 90s by hedge funds and private trading firms (who could get special margin treatment) as a way of trying to beat the uptick rule. As I recall, you start off by putting on an effectively neutral stock and option position like this:
Buy 100,000 JNPR @ 60 3/4
Sell 1000 JNPR May 60 calls @ 7 3/4
Buy 1000 JNPR May 60 puts @ 7
Basically this is a completely neutral initial position (i.e., zero risk/zero reward) and remains neutral regardless of what happens to the stock price. However, without the long stock it becomes a synthetic short. So when you want to "short" the stock, you just sell the long stock position. Since you're not shorting (you're actually selling long), the uptick rule doesn't apply.
So let's say the stock is currently at 60 and you want to short it. So you just dump the stock at 60 without regard for the uptick rule. Assuming you're right and the stock drops to say 58, you can buy back your 100,000 shares @ 58. Because of the options, you've locked in your $200,000 profit. You can keep doing this and (assuming you're right in your "shorting" overall), the net position keeps accumulating your profit for you.
I believe this used to only be done by hedge funds and certain trading firms that could take advantage of special margin for this kind of position though.
But I believe that under the new margin rules (assuming you have a broker who recognizes the special margin rules for long stock/long puts and/or collars) an individual could do something similar.
But to avoid being naked calls during the period when you are flat the equity, you'll probably have to do something like (in the example above) buy some 90 calls @ 1/2 so that when you're flat the equity, the short calls are effectively spread and you're not really naked the calls.
Your margin requirement will be higher than a hedge fund of course - a hedge fund would have to put up a very tiny amount of margin for the above position, but an individual even under the new rules would have to post 10% margin. So if let's say you wanted to do the above for 1,000 shares (instead of 100,000), you'd use 10 option contracts each and your margin would be 10% of $60,000 = $6,000. You'd still have a completely neutral starting position, but unlike the hedge fund you'd still have to post the 10% ($6K) in margin to hold it on maintenance margin (your initial margin would be $30,000 to set it up).
You'd also need to buy 10 May 90 calls for $500 and during the periods where you're flat the equity, your margin requirement would be $30,000 (30 point spread * 10 contracts on the 60/90 call spread). But, depending on your broker, you might never run into that if you never carried a flat equity overnight (i.e., you always bought back your 1,000 shares before the close).
The practicality of doing this is very dependent on your particular broker's margin rule recognition and intraday margin procedures. At a place like Bright Trading I imagine this would be easy to do. At a normal retail brokerage, it'll probably be anywhere from complicated to impossible.
If I've remembered "bullets" incorrectly, please someone jump in. Also, maybe def can comment on whether this kind of thing is practical at IB based on their particular margin rule recognition and handling of intraday margin requirements.