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 or buy coffee on Ko-fi.com

https://www.patreon.com/snowstar

https://ko-fi.com/snowstar5061

Weapon seller in the world of magic

A few minutes earlier;

Hanga District, Imperial City;

Just like any other day, Allen was operating the store. A couple of customers were roaming around to check out the available weapons.

This new upgraded store had a description attached with each section of weapons or explosives. So, if the customers know how to read, then, Allen wouldn't have even needed to explain what it is.

There was a separate chamber for the demonstration of low-end weapons like pistols and handguns, etc…

The weapons were stored in a glass chamber for display where they can't be taken out without the permission of the owner and the glass is very hard for the customers to even make a scratch with their strength was completely suppressed by Ultimate Defense. So, there's no way of theft even in the absence of Mark.

A customer with an unexpected surname