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! 2,000,000 credits were deducted. You unlocked JAS 39D. Check out the gallery for details.

Maximum speed: Mach 2 (2,204 km/h, 1,372 mph) at altitude

Ferry range: 3,200 km with drop tanks

Service ceiling: 15,240 m (50,000 ft)

Guns: 1 × 27 mm Mauser BK-27 Revolver cannon with 120 rounds

Hardpoints: 8 (three on each wing and two under the fuselage)

Equipping Gripen aircraft with nuclear-capable Brahmos missile?