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

Her words were the same as Allen but her actions were a bit different. Instead of a salute, she folded her hands together, interlocking her fingers while letting out a smile on her face.

"Eh? Smile?" Mark was stunned once again. He thought she was expressionless like Allen but that was before she got activated. However, once she was activated, even Mark had trouble believing that she was an android, not a sweet girl from the next door.

"Is it because I named her Alina?" For a moment, Mark couldn't help but wonder considering the name of the word means bright, beautiful.

He proceeded to inspect her to check the details.

Name: Alina Spencer

Spirit Path: Assassin

Rank: 6-circle (Intermediate)

The town of Daqing