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

Mark activated his Sage eyes without wasting any time in inspecting the details of the monster with the body of an ox, four horns with two protruding from the forehead and the remaining two protruding from the back of its head, human eyes, and pig ears.

Looking at its prey, the beast let out a sound that is similar to a goose, although it was a bit too loud for a human. Mark was forced to close his ears for a second while staring at its details.

Description: A monster from the undying lands.

"Just a 7-circle monster, huh?" Mark felt more relieved upon seeing that his opponent is someone he can defeat without relying on external assistance.

However, the problem here is that he doesn't have much experience in close combat.

The trial of the Holy beasts (part-2)