In the list of weapon effectiveness in percent between WWII and teh Korean War, the big standout in more deaths was something called 'other fragmentary explosions' that was 0.3% in WWII, and 7.4% in the KW, whatever that was.
It's not Grenades, Landmines, Boobytraps, Rockets and Bombs, those were all covered in other categories.
Besides whatever 'other' was, a change was in Grenades, that I listed upthread.
Weapons that caused fewer deaths in the KW vs WWII, was landmines, 1.7% less, explosive shells, 1.6% less and Rockets and bombs, 1.4% less
So that does show to me, the real weakness in the Chinese and DPRK arsenal was in artillery and bombs, and in defensive landmines, not small arms, that had 1.4% more deaths than WWII.
Bombs, hard to do, given the airpower situation, and having a good ground attack plane, the Il-10, the improved Sturmovik, had high losses against the Prop fighters like the Corsair and F-51, let alone the jets, so that's out.
That leaves more artillery and rocket launchers, that's probably doable.
And with all that, the change is likely to be just a few percent: I see nothing that could be introduced as a 'game changer'