Ack-Ack, You can not use the tracers as a reference for testing, there are 5 bullets per 1 tracer.
Did some simple testing here and I can fire 1 bullet about 1/3 of the time, using ammo counter for the mesure,by tapping the F key as fast as I can.
In the real 38 the first bullets out of the gun on a triger pull would not be at exatly the same time , they might be fired closer to the same time then in AH, but there after they would all be out of sync. To simulate this we would have to put in random firerates vs fixed fire rates for all guns.
And also unlike what you said, if you see the muzzle flash a gun has fired. It could just a non tracer round.
The thing to rember is if you fire a 1/2 sec burst in AH or in real life you will get the same number of bullets fired.
HiTech