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

*Ding! Congratulations, you won '+2 chance' as a reward.

'+2' reward on the lottery wheel doesn't give him any benefit. All it does is to remove the empty spot and let him spin again for the remaining rewards.

Since Mark already possessed 10 luck points (for the next 5 minutes), it isn't useful to him but he was worried that he will draw +2 at the end where there aren't any options and waste a week of waiting time.

Now that it had already arrived, he felt as if a small burden was removed from his head.

"Unique Skill, Peak potion, Reconnaissance satellite, and light combat aircraft."

A new wheel popped up, which is equally divided into four rewards. He clicked on the spin once again.

*Ding! Congratulations, you won 'unique skill' as a reward.

*Ding! Two attributes are detected in your body. Please select one attribute to choose a random unique skill.

Overpowered Lightning clone