It's not about charging handle per se, as almost all of these 'pistol-to-carbine conversion kits' have a piece to actuate slide of the pistol so that way it 'acts' like a charging handle
for e.g. everybody's favourite here,Micro Roni,red square is 'charging handle' on it
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BUT important point that everybody is missing regarding these 'kits' are they are just shells with buttstock and rails in which a pistol recides,to give better gripping of a full auto pistol, at best it's a 'jugaad' to use a full auto pistol like an SMG.
otherwise here it is, a pistol with butt,vertical grip and other expansions
View attachment 73750
Now coming back to Asmi, we can clearly see it from observing the lower part that it's not a separate pistol,rather it's given a shape like one.It is clearly not a conversion kit = empty shell but houses a dedicated mechanism inside ala a different,dedicated gun on its own!