how about a 'dragons breath 'style round for the 40mm grenade launcher?

an frangible container instead of a grenade, containing finely powdered aluminium and smokeless proppellant

as you fire a burning cloud of Al would erupt from the muzzle

Herald

the only problem is not always having the option of target recognition. not to mention the things are usually hefty and awkward to say the least. no one wants to try being tactical whilst looking like a scuba-diver.

The "human rights" people have effectively banned napalm, so a flame thrower is right out.  Besides, the man portable flame thrower has always been a bit of a desperation weapon, used mainly because there were few effective alternatives.  They are short ranged (<50m, max.), bulky, difficult to deploy, and prone catastrophic failure when hit.  Vehicle mounted versions with their longer range and massive fuel loads (particularly when carried in a towed trailer) are much more practical.

 

Thermobaric warheads on rockets and missiles largely replaced the flame thrower, with a variety of improvised devices filling the remaining needs.

 

I remember one described on this site from a while back that consisted of a barbecue size LPG cylinder, some C-4 and det cord that was supposed to be perfect for bringing down houses in Faluga.