Well it seems any D6 based system is prety easy to port over to Shadowrun eh? Since CP2020 uses almost the exact same damage progression as GURPS you can use the same conversion (with a twist or two).
Yes I know Gurth already converted these weapons! No, I did not look at his conversions compared to mine. It does match pretty closely with the Firearms Creation Guide on Rayguns site.
SMALL ARMS
Power
Figure the total damage the weapon would do in a single shot (including
any adders or subtractors). Divide by 2 (round down if the damage
staging is above Light).
a. If weapon is staged above Light damage then halve the power
again (round up).
Damage Level
Take the amount of D6 damage the weapon does and divide that by
two.
a. Round up if the result is less then 4.
b. Round down if above 4.
Then consult the following:
1 - Light
2 - Moderate
3 - Serious
4+ - Deadly
HEAVY WEAPONS
Power
The weapons Power is calculated as normal.
Damage Level
Total the damage and divide
by 6, round up.
Take that result and divide by 2, round down and consult the damage level table above.
Anti-Vehicle
Anything that uses D10 in
CP is a Anti Vehicle (AV) weapon in Shadowrun (i.e. no damage
level reduction)
Note: The original CP2020 damages and calibers are listed next to the names.
BudgetArms C-13 1d6(5mm)
3L
Dai Lung Cybermag 15 1D6+1(6mm)
4L
Federated Arms X-22 1D6+1(6mm)
4L
Militech Arms Avenger 2D6+1(9mm)
7L
Dai Lung Streetmaster 2D6+3(10mm)
8L
Federated Arms X-9 2D6+1(9mm)
7L
BudgetArms Auto 3 3D6(11mm)
9L
Sternmeyer Type 35 3D6(11mm)
9L
Armalite 44 4D6+1(12mm)
6M
Colt AMT Model 2000 4D6+1(12mm)
6M
Uzi Miniauto 9 2D6+1(9mm)
7L
H&K MP-2013 2D6+3(10mm)
8L
Federated Arms Tech Assault II 1D6+1(6mm)
4L
Arasaka Minami 10 2D6+3(10mm)
8L
H&K MPK-9 2D6+1(9mm)
7L
Sternmeyer SMG 21 3D6(11mm)
9L
H&K MPK-11 4D6+1(12mm)
6M
Ingram MAC 14 4D6+1(12mm)
6M
Militech Ronin Light Assault 5D6(5.56mm)
8M
AKR-20 Medium Assault 5D6(5.56mm)
8M
FN-RAL Heavy Assault Rifle 6D6+2(7.62mm)
9S
Kalishnikov A-80 Heavy Rifle 6D6+2(7.62mm)
9S
Arasaka Rapid Assault 12 4D6(00)
6M
Sternmeyer Stakeout 10 4D6(00)
6M
Barrett-Arasaka Light 20 4D10(20mm)
10D
Scorpion 16 Missile Launcher 7D10
17D
Militech Arms RPG-A 6D10
15D
C-6 Plastic Explosives 8D10 per kg
20D
Mine (all types) 4D10
10D
K-A F-253 Flamethrower 2D10
10M