It's much easier with a co-op partner.
When I did it, we split the targets between us in a predefined fashion so we had the whole run choreographed.
I think aiming is necessary but only for a split second i.e. aim-shoot all at once.
gaming.stackexchange.com/users/80/monorailkitty
Use the pistol you start with and the Deagle.
Line up your shots so one bullet takes out two targets (possible 3 or so times).
Switch to the other pistol instead of reloading.
gaming.stackexchange.com/users/1445/alex
The key to completing The Pit in under 30 seconds is accuracy.
The more accurate you are, the higher your bonus and the more seconds that are knocked off your actual time to give your final "score" time.
If you hit any civilians, forget it - start again.
Also, try and make use of the "snap" auto-targeting feature if you have the opportunity.
Other than that, it's just practice.
It can be done solo - I did it a few weeks ago myself.
gaming.stackexchange.com/users/176/C.McAtackney
I did it solo, after a gazillion tries, found out that lining up targets is the key, and reloading as rarely as possible.
Use the MP5, its aim-down-sight (ADS) and reload time is shorter than others.
Run between targets, ADS, fire single shots, AIS, repeat.
Melee the target at the top of the stairs, reload before jumping down.
gaming.stackexchange.com/users/4182/DrFish
Choose your guns: I recommend ACR and M9 Tactical.
Switch weapons: In the house, as soon Shepard says MELEE Switch to your pistol, continue like that.
Practise:
Don't just think it'll be a one time miracle, practise.
Don't hit civilians.
gaming.stackexchange.com/users/443/Redemption
Keep moving....
the game itself gives you hints: if you listen to the voices talking as you negotiate the course you hear something about using the Desert Eagle.
I personally used the M9 and the .45, but the Eagle is good.
Pistols are faster to change to, and you also seem to move quicker.
You can still auto aim as you move, it will slow you down a bit but not too much.
You can move and shoot at the same time in other words.
Hitting two targets is key, you have the possibility of doing it five times (I think).
At the third set of targets inside the house, change weapons at the top of the stairs as the dude yells "melee".
Once outside, If you've got double targets straight in front of you nail them, otherwise turn to your right and nail them (if you don't get the sync for hitting double targets here, I found shooting right to left is the fastest).
Reload before you jump and take out the two targets on the left simultaneously, then move right.
Nail these guys here, the hit your two final targets.
Remember, move at all times.
Its the only way I found to beat the obstacle.
gaming.stackexchange.com/users/None/
There are some perfectly workable solutions here already, here's another.
I often run through the pit before a play session in order to warm up and "calibrate" my thumbs.
If I'm not hitting stationary targets without any lag, I'm not going to hit moving ones in an actual game.
My goal is to get through in under 30 seconds twice in a row.
With the M4.
Since I'm warming up for actual play, I use a real weapon like I'd use in the game.
You could use one of the other weapons beside the M4 if that's more your style, such as the SCAR or the MP5.
You should be able to get all the way through the course without reloading, so don't worry about your secondary weapon.
You can get through without reloading by firing single bullets, rather than bursts.
You can get away with firing a few 2-3 shot bursts, but too many of those
and you'll have to reload, ruining everything.
It's also very helpful to line up targets and hit two at a time.
This also helps conserve ammo.
Double opportunities:
Before you enter the first room, you can line up one of the targets at the sandbags with the one moving back and forth in the lower room windows.
Depending on your timing, you might be able to line up some of the targets at the top of the stairs, after using your knife.
After jumping down you can line up almost every target with another one.
The one on the far left lines up with one deep.
You can aim at the deep one as you're falling, and once the close one is in the way, shoot.
At the very end, don't even aim at the targets in front of the exit tunnel.
You can hip fire right through the one in front and hit the back, consuming whatever bullets you have left.
Sprint to the end with your empty gun.
gaming.stackexchange.com/users/108003/DCShannon
I've completed the campaign mode of  Call of Duty: Modern Warfare 2  and I want to complete Special Ops. I'm stuck on "The Pit". We have to complete the level in 35 seconds to get three stars. I was only able to get two stars no matter how many times or how hard I tried. Can you give me some suggestions (e.g., shoot from the hip, or shoot while running rather than aiming down)?
How do I get three stars on "The Pit" in Special Ops?
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<call-of-duty-modern-warfare-2>
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gaming.stackexchange.com/users/116/Abdulsattar Mohammed
Choose your guns carefully: ACR and M9 Tactical or the pistol and the Deagle. The key is accuracy and reloading as little as possible. The key to completing The Pit in under 30 seconds is accuracy. Also, try and make use of the "snap" auto-targeting feature if you have the opportunity.  Choose your guns, e.g.ACR and M9 Tactical are good and then use the pistol you start with and the Deagle. Switch weapons. In the house, as soon Shepard says  MELEE  switch to your pistol, continue like that.  Lining up targets is the key, and reloading as rarely as possible.  Hitting two targets is also key, you have the possibility of doing it five times. Having a warm up by running through the pit before a play session helps.
Choose your guns, e.g.ACR and M9 Tactical are good and then use the pistol you start with and the Deagle. The key to completing The Pit in under 30 seconds is accuracy. Also, try and make use of the "snap" auto-targeting feature if you have the opportunity.   Lining up targets is the key, and reloading as rarely as possible.    Switch weapons. In the house, as soon Shepard says  MELEE  switch to your pistol, continue like that.   Hitting two targets is key, you have the possibility of doing it five times. Having a warm up by running through the pit before a play session helps.