Handheld
Firearm or gun, usualy of a size wielded with one hand but can also mean all kinds of firearms. Slang usualy used by YouTubers due to TouTube's stupid rules about avoiding any kind of buzzword so the content creator wont be de-monetized.
Example:
"...then fires his handheld five times at the monster before he turn it upon himself as he realize the monster can't be hurt."
"...then fires his handheld five times at the monster before he turn it upon himself as he realize the monster can't be hurt."