To demonstrate that muzzles wrongly rely on the main weapon's GunParticles class - despite having a GunParticles class of their own - follow these steps:

1. - Add the following code to an existing addon's config.cpp (or download the MuzzleGunClouds.pbo file attached in the next post):

class CfgWeapons {
        class Rifle;
        class Rifle_Base_F : Rifle {
                class GunParticles {
                        class FirstEffect;
                };
        };
        class arifle_ARX_base_F : Rifle_Base_F {
                class Secondary;
        };
        class arifle_ARX_blk_F : arifle_ARX_base_F {
                class Secondary : Secondary {
                        class GunParticles : GunParticles {
                                class FirstEffect : FirstEffect {
                                        effectName = "CannonFired";
                                };
                        };
                };
        };
};

2. - Compile the addon and launch the game (with that addon enabled)

3. - Go to the Virtual Arsenal and equip the "Type 115 6. 5mm (Black)" (weapon class: "arifle_ARX_blk_F"), load a magazine in the main muzzle (6.5mm) and one in the secondary muzzle (.50 BW)

4. - Fire a round with each muzzle. Notice that both muzzles use the regular firing smoke effect.

5. - Open the config viewer and browse to:

"CfgWeapons" >> "arifle_ARX_blk_F" >> "Secondary" >> "GunParticles" >> "FirstEffect"

Notice that the "effectName" entry has been changed to "CannonFire", yet the secondary muzzle isn't using that particle effect.

6. - (Optional additional step: change the "effectName" entry in:

"CfgWeapons" >> "arifle_ARX_blk_F" >> "GunParticles" >> "FirstEffect"

to "CannonFire", and (after a config merge/game restart) fire a round with each muzzle. Notice that both muzzles are now using that particle effect.)

Instead of always relying on the weapon's GunParticles class, the engine should first check if there is a GunParticles in the muzzle's class, and use that if it exists. Otherwise, it should fall back to the current behaviour and use the weapon's GunParticles class.

Additional note: I didn't verify if this behaviour also applies to the sibling classes "GunFire" and "GunClouds", but they may also be affected.