[Finding] No Recoil/Spread

Well I was reading up on a thread for Warrock about no recoil/spread and has anyone tried the following? I've been doing it a little and when I got the values down to 5-10 addresses I noticed the gun having different values when I pulled out different ones. While I am not sure if I messed up (you have to do this for awhile) or it is just not possible.

What you need:
Pistol
Assault Rifle

Why?
The pistol has a larger crosshair than the rifle.

1.) Pull out Pistol
2.) Unknown Initial Value
3.) Pull out Rifle
4.) Decreased Value
5.) Pull out Pistol
6.) Increased Value

Repeat 3-6 ALOT of times.

Once you start to get down there you see some numbers changing when guns are pulled out. The number match what you think a gun would be. IE: Pistol = Smaller Value, Rifle = Larger Value.