Base
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1.M1911
Just about no way not to get this one

Bridge
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2.PPK
In the driver seat of one of the vehicles before you get on the Bridge
3.Single Action Army
In the case on the 2nd story(2 more are in the mines later)
4.Tokarev
In the office, top right cabinet

Canyon
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5.Walther P38
Back seat of the Humvee, Right side
6.Mac 11
In the back of the Gift Shop
7.Scorpian
On the way to the generator turn left after the 2nd gate and it will be on the crate

Mines
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8. G18
Next to the skeleton where the people set up camp
9. Shotgun
After you blow up the barricade its on the table right there(3 more can be found later in the game)
10.Mini Uzi
Next to the wench

Trainyard
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11.FN Five Seven
Between the to trains
12.MP9
Bottom Office(2 more found later)
13.Sniper Rifle
On the roof of the train building(2 more found later)
14.Glock with Light
On the crate in the gated of area after the 2nd sniper
15.Grenade launcher
In the tunnel before the big hoard turn back and its on the crate near the humvee
May want to keep it, its the only one I know of and you get more ammo for it at the end
16.Spectre
Near the grenade Launcher(2nd at the depo)

Refinery
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17.Uzi
In the area you get the key card from(2nd in the shed you pass through on Sunshine)
18.Berreta M9
Same area as the Uzi
19.Minigun
In a large ally with lots of conveniently placed Zombies to kill.
20.SIG P250C
just after the Minigun section after the door on the tool table(2nd in one the trailer homes)

Trailer Park
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21.Python
On the crate with the guy that died with the nice view(another at the weapon depo)

Sunshine
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22.Desert Eagle/Gold Deagle
On the military crate at the start(Becomes gold if you pick it up with the Hard Boiled Achievement)
23.MP5
2nd story of the farm house(2nd at the weapon depo)
24.Makarov
At the weapon depo its on the right side of the crate

Pistols (300 Max Ammo)
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M1911-------------7
PPK----------------8
Tokarev------------8
P38-----------------8
G18-----------------17
FN Five Seven---20
Glock with Light-15
M9------------------12
Sig P250C--------17
Makarov-----------8

These 4 take 2 body shots instead of 3 to kill.
Single Action Army-6
Colt Python-----------6
Desert Eagle---------7
Gold Deagle----------7


Sub-Machine Guns(1000 Max Ammo)
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Mac 11----16
Scorpian--20
Mini Uzi---20
MP9-------25
Spectre---30
Uzi---------32
MP5-------40

Others
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Shotgun---------------3(100 Max Ammo)
Sniper Rifle----------Can't be reloaded, not counted how may shots it has.
Grenade Launcher-1(heard 20 Max Ammo)
Minigun---------------Unlimited?

For the most part every gun here is only 1 handed the
Shotgun, Spectre, and MP5 can be used with 2 hands