Going back to the 5.8mm ammo, task and purpous has a new video on the chinese bullpup ...just uploaded right now

But the problem is that bullpup rifles like QBZ95 are now a marginalized part of China. The current new rifle like QBZ191 is just an imitation of the AR series and HK416, even the buttstock can only be retractable but not foldable (because the built-in reintroduction pipe has been almost reached the bottom plate of the buttstock like those old M16/M16A1), I think this can already explain the problem. So the problem of insufficient barrel length (14.5 in, the same as M4A1) will not only be faced by the American AR rifle, but the new Chinese rifle will also be troubled by this problem.