[1.187] The weapons mod isn't support multiple shoot sounding effect.

  <Weapon>
      <Id>
        <TypeId>WeaponDefinition</TypeId>
        <SubtypeId>USN_Mark7_300</SubtypeId>
      </Id>
      <MissileAmmoData RateOfFire="100000" ShootSoundName="16_50Mk7fire" ShotsInBurst="3"/>
      <ProjectileAmmoData RateOfFire="100000" ShootSoundName="16_50Mk7fire" ShotsInBurst="3"/>
      <ShotSoundName>WepSniperFire</ShotSoundName>
      <NoAmmoSoundName>WepPlayRifleNoAmmo</NoAmmoSoundName>
      <DeviateShotAngle>0.33</DeviateShotAngle>
      <ReleaseTimeAfterFire>1</ReleaseTimeAfterFire>
      <MuzzleFlashLifeSpan>700</MuzzleFlashLifeSpan>
      <AmmoMagazines>
	<AmmoMagazine Subtype="USNMark7_AP" />
        <AmmoMagazine Subtype="USNMark7_HE" />
	<AmmoMagazine Subtype="USNMark7_Nuke" />
      </AmmoMagazines>
	 <Effects>
	  <Effect Action="Shoot" Dummy="muzzle_effect_1" Particle="Explosion_Warhead_15" Loop="false" />
	   <Effect Action="Shoot" Dummy="muzzle_effect_2" Particle="Explosion_Warhead_15" Loop="false" />
	    <Effect Action="Shoot" Dummy="muzzle_effect_3" Particle="Explosion_Warhead_15" Loop="false" />
		  </Effects>
	<ReloadTime>15000</ReloadTime>
    </Weapon>

In my mod, I place two dummy (muzzle_projectile and muzzle_missile) in the barrel.

So, the weapons able fire projectile and missile, if the player switch the ammo.

After the 1.187, the se isn't support multiple shoot sounding effect anymore.

 <MissileAmmoData RateOfFire="100000" ShootSoundName="16_50Mk7fire" ShotsInBurst="3"/>
      <ProjectileAmmoData RateOfFire="100000" ShootSoundName="16_50Mk7fire" ShotsInBurst="3"/>