This isn't even my full power
Gunpowder in wholly agrarian societies is normal. In fact, the majority of gunpowder’s existence has been in agrarian societies! Gunpowder has been in Europe since the ~1400s, but the industrial revolution didn’t start until the ~1800s! (You could maybe drop that date back to the 1700s due to waterwheel factories, but then I could drop gunpowder back to the 1100s in China)
When the conquistadors invaded Aztecs/Incas in the 1500s, they were shooting guns handmade by blacksmiths with wrought iron from charcoal-powered forges.