Mike Irwin said:
I use the front sights on my S&W revolvers as back scratchers.
VERY effective.
The Patridge sights are best!
During my training days and especially at the academy we went over the fundamentals quite a lot. Besides that, we studied the Newhall reports (it was only a couple of years prior) and two decade-long studies - one from LAPD and one from KC, Mo. In the two studies, officers were asked questions about what they did and what they saw. Some specific questions (Do you remember using your sights? What do you remember about using your sights?) brought up some good points for training programs.
Officers who survived uninjured or with only minor injuries
all recalled using their sights. Some of them vividly. One officer shooting in the early dawn light recalled seeing his red-ramp front sight so clearly that he could see a bit of holster leather caught in the 3rd serration. He still bullseyed the suspect with his 2nd round. Other officers reported similar results.
[1]
Officers who were injured in shootouts did not recall using their sights by a 3.5:1 ratio. For every injured officer who used his front sights, 3.5 others did not. One officer who was hit in the side and had fragments hit him in the forehead fired five misses and retreated to reload. With blood in his eyes, he calmed down, wiped at his forehead and re-engaged. He said he focused on his front sight and took the first shot he had. Five misses between 2 to 7 yards and one solid hit at 16 yards.
Almost none of the officers reported being able to determine if they'd made a hit unless the suspect showed a reaction to it (clutching the area, bending over, turning or falling).
[2]
The lessons learned were that focusing on the front sight provides the best accuracy in a gunfight. And it reinforces the axiom:
Speed is fine, accuracy is final. One may succeed at close range by "point shooting" where the front sight is in the peripheral vision (with practice). One can also succeed at close range if the eye can see the front sight is on the target, with practice. But one will almost certainly succeed if focused on the front sight.
[1] One officer was wounded because he switched from his S&W to a Colt Python with a yellow insert on the front sight. In the fight, he expected the red-ramp sight and couldn't see the yellow one until being hit in the thigh jogged his memory. That's an important lesson right there.
[2] An officer said that he could see the suspect's clothing "dimple" from bullet impacts but the suspect didn't react to them until he was hit in the throat. But most officers said it was difficult to determine if a hit was acutally made.