Communist munitions from WW2 era are not the quality of western powers
Jap stuff was not the best either, especially after war turned against them.
Chinese Commie might be worse. They didn't worry about human life not
even their own men. They had unlimited man power so a grenade that
when off prematurely was no big deal. In the American Legion magazine
every once and a while you will see an article " Last Causualty of Battle X,
1st or 2nd WW. Some farmer plows up a shell and it goes off. There have
been cases of Civil War shells going off that have been in the earth since.