Open [Game Settings>WEAPONS]



On the right side you see the [Per Weapon Configuration]
With the command cg_guny you can change the horizontal position of your weapon.

I have tried some positions and found some values for the center positions:

• Gauntlet: cg_guny 3;
  
• Machine Gun: cg_guny 3;
  
• Shotgun: cg_guny 2.755;
  
• Grenade Launcher: cg_guny 5.125;
  
• Rocket Launcher: cg_guny 5.15;
  
• Lightning Gun: cg_guny 2.725;
  
• Railgun: cg_guny 5.55;
  
• Plasma Gun: cg_guny 4.1;
  
• HMG: cg_guny 3.81;
  
• BFG10K: cg_guny 5.4;

For some it's not working perfect. LG's shaft is centered, not the weapon.

Gauntlet:

Machine Gun:

Shotgun:

Grenade Launcher:

Rocket Launcher:

Lightning Gun:

Railgun:

Plasma Gun:

HMG:

BFG10K: