The Recoil has 2 main parts:

1. Gun recoil

• This recoil only acts on the gun and it position and rotation. You can see this in versions before 0.0.3 when this was the only type of recoil.

2. Camera recoil

• This recoil acts on the camera rotation.  It rotates it up and sideways, the last one is very suttle for most of the times.

3. Sidenotes

• Because  this system has 2 parts be careful, it can throw you off course because the guns recticle may be shifted from the point it shoots.
• So you have to control recoil while aiming a bit lower than the reticle to hit the target.
• All of theese get's decresed if you aim, crouch or not walk, all of them decrese it separetly, but together they can add up. 

The spay works the same as in RawPoly FPS there's a maximum angle on all the 2 dimensions where the bullet'as trail can rotate. So essentialy it's cone area of the spread, and it gets bigger the farther you go.

All of theese stats differ by gun and will go under significant fine tuning, so don't expect it perfect, but now you know the core idea of the system and you will be able to get better.