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Honestly I really do not think this charging handle has a problematic design in terms of shape and size.
I will worry more about the fact that the charging handle is reciprocating on the QBZ191 over its shape and size.
If you accept the fact that the default charging handles on AKs (AKM, AK74s, AK100s, AK12s) are sufficient, then I really do not see the problem with the charging handle on QBZ191. The size and shape between QBZ191 and AK's charging handles are really not that different.
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The Swiss Arms SG553s are good for cold weather conditions (some versions of them have the trigger guards fold-able to accommodate for thick winter gloves, so you can be pretty sure that the charging handles on these rifles are usable when you have thick winter gloves)
Well, the charging handles on these SG553s only seem marginally bigger than the ones you find on QBZ191 or AKs.
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I really don't think there is anything wrong with the design of the charging handle, it seems like a pretty solid design tbh.
I believe only the cold weather conditions matter for the shape of the charging handle, since having thick gloves do interfere with using a tiny charging handle like the ones you see on a P90 or Skorpion. Being in muddy or watery conditions really do not interfere that much with the usage of a charging handle, as long as your hand can get onto the charging handle, you can pull it. Furthermore, other mechanisms about the design of the gun will interfere with the operations of the rifle long before the charging handle becomes a problem...
As for SCAR's charging handle, I have never used it so I cannot comment on it too much. But I thought the problem with the SCAR is more about the charging handle being placed too high on the gun that it reciprocates too close to the optics rail which can cut people's fingers. I have never heard of people complaining about SCAR's charging handle being too hard to find or pull.
When's the last time you failed to load the gun because you cannot find and grab the charging handle? I think I can pull the charging handle on QBZ191 easily even if I have I lube up my hands. If you are carrying and caring for your rifle normally, you are not gonna get a huge clump of mud or ice on the side of your gun to block your charging handle, I haven't seen any mud test on Youtube that has resulted in that scenario. The dirt and derbies mostly just fall off when you pick up the gun from the ground. Besides, mud tests are not really valid tests for the durability of a rifle anyways.
As for the night argument, I doubt a soldier that uses his or her weapon often will just suddenly forget the location of the charging handle at night. A rifle will become an extension of your body after some use, in fact, any tool will become an extension of your body if you use it often enough. You are not gonna forget the location of the charging handle of a gun you are holding just because you cannot see it clearly at night. If that is the case, then the problem is not with the design of the charging handle, it is with the solider who uses it. Imagine your soldier says he cannot find his mag pouch on his chest because the mag pouches are not bright or big enough at night, that will be ridiculous.
I can totally see where your worry is coming from, but I think you are over concerned regarding the shape and size of the charging handle.
I really doubt the current version of the charging handle will be a problem for the PLA, after all, the terrible charging handle on Type 95 has not prevented PLA soldiers from operating them smoothly and efficiently. (I think this is also the reason why later versions of the AR changes the location of the charging handle, it is just too awkward to be directly on the top, under the carry handle like QBZ95)
The reliability issue of the new rifle will really not gonna be coming from the shape or size of the charging handle, but from other core systems of the rifle.