Snowstar

Mark is a genius military weapon designer who was kidnapped by a mafia gang after refusing to work for them.
They forced him to design unique weapons for five years, until one day he successfully escaped only to get shot by his trusted comrades.
*Ding! You awakened a weapon system.
When he opened his eyes, he was in a different body and in a different world.
"You want to kill a wild boar without being detected? Forget about bow and arrow. Here, I present you this sniper rifle."
"You want to kill a horde of goblins from the sky? Forget about those flying carpets and brooms. Here, I present you the fighter jet." 
"You want to kill a dragon? Forget about taking the help of the S-class adventure team. Here, I present you a nuclear bomb."
Join Mark Spencer/ Lu Zhen as he brings the whole world to its knees with the help of his weapon system.
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Note: Author isn't born in an English-speaking nation and has no editor either. So, please be understanding if there are any grammatical errors.
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Author's current works: War Online, My Soul card is a Reaper
Author's other notable works:  The Last Slytherin, The Sharingan Hyuga
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You can also support the Author through Patreon

https://www.patreon.com/snowstar

Weapon seller in the world of magic

After clinching a huge deal with Feng Wu, Mark left the place.

Feng Wu later returned to the bandits' village and called for an urgent assembly.

The elders were summoned to the council room where they usually discuss the matters going on in Western Yan. They had their own group of loyal spies working in the kingdom, of which, one of them was even a eunuch working at the palace.

Never once they had abandoned the idea of reclaiming their throne and returning to their homeland. But, the conditions in the past decade weren't in their favor.

When Feng Wu explained about the panzer that can take on 4-circle realm experts with ease, the elders were baffled and later, expressed their support to him.

After deciding on the numbers, he summoned merchant Huo Fen, who was imprisoned here a few weeks ago and later, got trapped by working as an instructor to the bandits that were new to firearms.

Dungeon of Taslan (part-1)