[MP2]

The values (well, the 'gangster' level one - hitman is always 999 and poor is always 0) vary from weapon to weapon, and can be found in data\weapon.dat in your GTA:SA directory, here's an example:


$ SAWNOFF INSTANT_HIT 25.0 30.0 350 -1 3 sawnoff 2 10 0.56 0.0 0.15 0 0 0.7 1.0 6 15 6 6 15 6 30 3033
$ SAWNOFF INSTANT_HIT 30.0 35.0 350 -1 3 sawnoff 2 10 0.56 0.0 0.15 1 200 0.8 1.1 6 15 6 6 15 6 30 3033
$ SAWNOFF INSTANT_HIT 35.0 35.0 350 -1 3 sawnoffpro 4 10 0.56 0.0 0.15 2 999 0.9 1.3 6 15 6 6 15 6 30 3833

Values are poor, gangster and hitman.

As for what they all do, I compiled a list a while ago:

9mm
40: Increased ROF and improved accuracy
999: Duel wield

Silenced
500: Strafe faster, increased ROF and improved accuracy
999: Increased ROF, strafe faster

Deagle
200: Improved accuracy, strafe faster, increased ROF
999: Improved accuracy, strafe faster and whilst firing

Shotgun
200: Improved accuracy and strafe faster
999: Improved accuracy, strafe faster and whilst firing

Sawnoff
200: Improved accuracy
999: Duel wield + increased ROF

Spas 12
200: Improved accuracy, increased ROF, strafe faster
999: Improved accuracy, strafe faster and whilst firing

Uzi
50: Improved accuracy
999: Duel wield, increased ROF

Tec9
50: Improved accuracy
999: Duel wield, increased ROF

MP5
250: Improved accuracy, strafe faster
999: Strafe faster and whilst firing

AK47
200: Improved accuracy, strafe faster
999: Improved accuracy, strafe faster and whilst firing

M4
200: Improved accuracy, strafe faster
999: Improved accuracy, strafe faster and whilst firing

Some things may be missing though.