Some questions about early Chinese firearms

Haakbus

Ad Honorem
Aug 2013
3,808
United States
Early Chinese guns such as the shenqiang as well as Vietnamese guns used sabots, large wooden arrows, and touch hole covers. I was under the impression that at least the sabots and touch hole covers were Vietnamese innovations. However the Great Ming Military blog (Shen Qiang (神鎗)) says the Chinese versions predate the Vietnamese ones. Is this true? Do we know very much about the origin of these features?