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

Genesis Weapon store, Imperial City;

"Here is the remaining payment." Mark handed about 19 pouches filled with 5000 gold coins in each and another pouch with 145 gold coins to Merchant Zheng Ha upon receiving the goods.

Adding 30k gold coins of advance payment, Mark had given him about 125145 gold coins in total, of which the order is 121,500 gold coins. The remaining 3645 gold coins are Zheng Ha's commission fee.

The merchant was very happy to score it big and felt like his hard work had paid off. On the other hand, Mark's wealth dropped down to below 100k for the first time since he had extorted that amount from the noble clans.

Fortunately, there are still pending orders, and once they are completed, his unaccounted money will not only turn into his official wealth but also increase further after the remaining amount is being paid.

The Devil's hand