I often read a light novel that tells a story about a person who is transferred from their high tech modern society Earth to a fantasy land. These persons often have some expertise in modern science such as computer programing, chemical engineer or maybe even they have a military experience, but most often they are just an expert gamers. And in the end, if their expertise/knowledge is explored in the story, they will implement it to make some kind of modern enterprise.
So, I'm just thinking...
Let's say, a person/a group of people from modern society 2016-up Earth are somehow transferred to a fantasy land that is still in the Bronze Age. Then that person/group somehow decided that they want to have a weapon that is close enough to the modern military on Earth, for personal use only.
"I/we need to survive, and at the same time build a military equipment that is close enough to modern military on Earth I/we need to build a sustainable factory from the scratch"
So, the question might be..
What kind of modern weaponry and equipment that is achievable with that limitation of bronze age?
What is the realistic approach for that to happen?
I prefer the maximum number of person that are transferred is 10, but it is okay too if the answer present a larger number.
Things that the person bring from the modern earth is limited to the size of a backpack.
local can be hired and trained to do the job.