The armor pen we values got in game are totally wrong. It should penetrate around ~42 mm at 5 meters, NOT 55 mm.
Source: Arma Fennica 2 : Sotilasaseet, Timo Hyytinen
Even if you don’t trust the source, all you have to do is to compare the gun with the Type 97 ATR and it becomes quite obvious that something is not right.
Solothurn S-18/100:
- Barrel length: 925 mm
- Cartridge: 20×105mmB
- Muzzle velocity: 735 m/s
- Pen in-game: 55mm at 5M
Type 97 automatic cannon:
- Barrel length: 1.065 m
- Cartridge: 20×125mm
- Muzzle velocity: 790 m/s
- Pen in-game: 45mm at 5M
Unless it’s using some sort of magic bullets, it’s not possible that the S-18/100 has equal or higher pen than the Type 97 ATR.