I'm slowly starting to consider PLA soldiers are either stubborn when it comes to attachments or it's a way to designate someone's field of expertise more obviously in a symbolic way.
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I mean, that setup for that particular soldier in the first picture is actually pretty good.
They use an aftermarket M LOK handguard (not the freefloated one that we've seen on patents), but it should be more sturdy than the usual handguard.
The optic is the QMQ-171 holographic sight with a magnifier behind it (first time we've seen the specific combo on a QBZ-191 afaik), and there's a laser and a light attachment on the handguard itself, with possibly a small foregrip on the bottom.
That's actually a pretty good loadout on the rifle itself -- the only way I would improve it is if they changed the handguard to the longer, free floated MLOK handguard that we've seen, but otherwise everything is positioned quite reasonably and sensibly.