I have done the weapons mod and all we need is a good MSpainter (Field Marshal ^^) and we can create dual weapons mod u know...so here is the (WM)

[Info]
Name=Dual Weapon's
Version=1.0

[USSOCOM]
Damage=344
FireInterval=12
Ammo=24
ReloadTime=130
Speed=180
BulletStyle=1
StartUpTime=0
Bink=0
MovementAcc=1

[Desert Eagles]
Damage=176
FireInterval=23
Ammo=14
ReloadTime=103
Speed=190
BulletStyle=1
StartUpTime=0
Bink=0
MovementAcc=1

[HK MP5]
Damage=216
FireInterval=6
Ammo=60
ReloadTime=190
Speed=190
BulletStyle=1
StartUpTime=0
Bink=-25
MovementAcc=1

[Ak-74]
Damage=230
FireInterval=11
Ammo=80
ReloadTime=300
Speed=240
BulletStyle=1
StartUpTime=0
Bink=-40
MovementAcc=1

[Steyr AUG]
Damage=146
FireInterval=1
Ammo=60
ReloadTime=300
Speed=260
BulletStyle=1
StartUpTime=0
Bink=0
MovementAcc=1

[Spas-12]
Damage=242
FireInterval=34
Ammo=14
ReloadTime=350
Speed=140
BulletStyle=3
StartUpTime=0
Bink=0
MovementAcc=1

[Ruger 77]
Damage=486
FireInterval=32
Ammo=8
ReloadTime=300
Speed=330
BulletStyle=1
StartUpTime=0
Bink=18
MovementAcc=3

[M79]
Damage=330000
FireInterval=1
Ammo=2
ReloadTime=1
Speed=110
BulletStyle=4
StartUpTime=0
Bink=0
MovementAcc=3

[Barret M82A1]
Damage=990
FireInterval=350
Ammo=20
ReloadTime=600
Speed=550
BulletStyle=1
StartUpTime=0
Bink=80
MovementAcc=6

[FN Minimi]
Damage=178
FireInterval=9
Ammo=100
ReloadTime=500
Speed=270
BulletStyle=1
StartUpTime=0
Bink=-49
MovementAcc=2

[XM214 Minigun]
Damage=96
FireInterval=4
Ammo=200
ReloadTime=699
Speed=290
BulletStyle=1
StartUpTime=50
Bink=-10
MovementAcc=1

[Flamer]
Damage=1200
FireInterval=6
Ammo=200
ReloadTime=5
Speed=105
BulletStyle=5
StartUpTime=0
Bink=0
MovementAcc=1

[Rambo Bow]
Damage=2400
FireInterval=1
Ammo=2
ReloadTime=50
Speed=210
BulletStyle=7
StartUpTime=0
Bink=0
MovementAcc=1

[Flamed Arrows]
Damage=1600
FireInterval=1
Ammo=2
ReloadTime=78
Speed=180
BulletStyle=8
StartUpTime=0
Bink=0
MovementAcc=1

[Combat Knife]
Damage=430000
FireInterval=6
Ammo=2
ReloadTime=6
Speed=60
BulletStyle=11
StartUpTime=0
Bink=0
MovementAcc=1

[Chainsaw]
Damage=4200
FireInterval=4
Ammo=80
ReloadTime=130
Speed=70
BulletStyle=11
StartUpTime=0
Bink=0
MovementAcc=1

[M72 LAW]
Damage=300000
FireInterval=1
Ammo=2
ReloadTime=540
Speed=230
BulletStyle=12
StartUpTime=1
Bink=0
MovementAcc=1

[Punch]
Damage=66000
FireInterval=6
Ammo=2
ReloadTime=3
Speed=50
BulletStyle=6
StartUpTime=0
Bink=0
MovementAcc=1

[Grenade]
Damage=150000
FireInterval=80
Ammo=1
ReloadTime=20
Speed=50
BulletStyle=2
StartUpTime=0
Bink=0
MovementAcc=1

[Stationary Gun]
Damage=180
FireInterval=10
Ammo=100
ReloadTime=366
Speed=360
BulletStyle=14
StartUpTime=0
Bink=0
MovementAcc=1


I didnt edit the Stats or Deagles(i edited Deagle's ammo cuz they have 7 and one Deagle doesnt fire 3,5 bullets so there are 17 ammo)

why didnt ya edit the deagles? 4 deagles would be uber!

All you did was double the ammo and power of each gun. ¬_¬

I think the problem is this:
Most guns do not fire more than one round per 'shot'. e.g. The Desert Eagles fire two rounds (Actually two different bullets fired in the same direction), and the shotgun fires quite a lot. Apart from that, I can't think of any.
But there isn't a way to change the firemodes in Soldat (So no LAW shotguns in that slot etc.). Well, yet.

Yup. The only official "double weapon" are the Deagles. You can fake it by changing the ROF, but it will still be seperate shots per 1 ammo. Deagles shoot 2 shots per ammo; have you never used them?